A tool for every task.
Convert files, organize documents and work out calculations. Find what you need, then explore a practical guide.
Start here
Compress a PDF online and check the result
Create a smaller PDF copy with four quality profiles. Compare file sizes and check readability. Temporary uploads are deleted after processing.
Open toolMerge PDF files into one document
Combine multiple PDF files into one document, arrange their order and download the result. Processing takes place in your browser.
Open toolConvert images to PDF
Combine JPG, PNG, WebP and other images into a PDF in your browser. Reorder pages and choose orientation and margins; files stay on your device.
Open toolPDF and documents
39Compress a PDF online and check the result
Create a smaller PDF copy with four quality profiles. Compare file sizes and check readability. Temporary uploads are deleted after processing.
Open toolConvert images to PDF
Combine JPG, PNG, WebP and other images into a PDF in your browser. Reorder pages and choose orientation and margins; files stay on your device.
Open toolCreate a PDF from text
Turn plain text into an A4 PDF with readable type, automatic line wrapping and selectable text.
Open toolExtract pages from a PDF
Choose pages or ranges and create a new PDF in the order you specify.
Open toolMerge PDF files into one document
Combine multiple PDF files into one document, arrange their order and download the result. Processing takes place in your browser.
Open toolPDF Metadata Reader: View Document Properties
Read common PDF information fields and page count in your browser. Files stay on your device; metadata does not prove authorship or authenticity.
Open toolRemove pages from a PDF
Remove pages or ranges and download a copy containing the remaining pages.
Open toolRotate PDF pages
Rotate every page or selected pages by 90, 180 or 270 degrees.
Open toolSplit a PDF into pages
Separate every PDF page into an individual file and download the files in a ZIP archive.
Open toolUniversal PDF Converter: 8 browser-based tools
Convert PDF pages to images, extract text, create PDFs from images, HTML or text, merge or split PDFs, and rotate pages in your browser.
Open tool10 Free PDF Tools and Guides for Common Tasks
Find PDF tools and practical guides for creating, merging, splitting, checking and sharing documents, with limits explained.
Read more10 practical tips to optimize PDF files
Learn how to identify images, fonts and attachments that add to a PDF, then choose changes for its intended use without assuming a universal size reduction or resolution.
Read moreAI and documents: privacy, permissions and hidden instructions
Prepare a safer working copy, limit the data you share and recognize instructions embedded in documents used with AI assistants.
Read moreBatch convert images to PDF in Windows without extra software
Use the Windows print-to-PDF feature to combine selected images into one PDF. Learn how to keep page order and when an online converter gives you more control.
Read moreConvert PDF to Word Without Losing Formatting: What to Expect
Learn why PDF-to-Word conversion changes layouts, when conversion is useful, and how to check text, tables and scanned pages.
Read moreHow to Convert Images to PDF and Check the Result
Learn how to combine images into a PDF, set orientation and margins, keep pages in order, and check image quality and privacy.
Read moreHow to Create a PDF Portfolio That Is Easy to Review
Plan a concise portfolio, explain your contribution, export it as a readable PDF and check the file before sharing.
Read moreHow to improve the quality of scanned documents
Choose a practical scan resolution, improve contrast carefully and check a document scan before sharing or using OCR.
Read moreHow to make a PDF smaller before sending it on WhatsApp
Learn how to prepare a smaller PDF, choose the right method and check readability before sharing it on WhatsApp.
Read moreHow to Make Digital Documents More Accessible
A practical guide to accessible PDFs: document structure, meaningful image descriptions, contrast, OCR limits and a careful review.
Read moreHow to Organize Travel Receipts in a PDF That Is Easy to Check
Separate originals from working copies, order travel receipts and check every page before sending a PDF.
Read moreHow to Password-Protect a PDF and Check the Result
Compare online and offline PDF password options, distinguish an opening password from permissions, and verify the final file.
Read moreHow to Protect Personal Documents Before Sharing Them Online
A practical guide to sharing identity documents more carefully: minimize data, redact it irreversibly, verify the recipient and understand messaging and metadata limits.
Read moreHow to Reduce a PDF File Size and Check the Result
Compare practical ways to make a PDF smaller, understand quality and privacy trade-offs, and check the file before sending it.
Read moreHow to scan documents with your phone and save them as PDF
Get clearer document photos, arrange pages and turn them into a PDF with a phone. Practical steps, file-size tips and privacy checks.
Read moreHow to summarize a PDF with AI and verify every claim
A practical method for checking facts, interpretations and missing details in AI summaries of PDFs, with a fictional example and a verification table.
Read moreHow to test AI on documents with your own answer key
A repeatable protocol for checking extraction, citations, missing information and tables using fictional files and a local checklist.
Read moreHow to write a clear, professional resume
A practical guide to organizing a resume, describing experience accurately and preparing a readable application file.
Read moreMake a Readable PDF from Document Photos
Photograph every page in even light, check the full frame and order the pages before sending.
Read moreMake a Smaller PDF for an Online Form: A Practical Checklist
Check the portal’s own file rules, prepare a legible PDF, reduce image-heavy scans and verify the final attachment before submitting.
Read moreOCR or AI: how to extract text and check the result
Compare OCR transcription with AI-assisted analysis, prepare a clear scan, and check codes, amounts, negations and table columns against the original.
Read moreOCR: extract text from scanned images and PDFs
Learn how OCR turns scanned images into text, how to prepare a page, and why important details must be checked against the original.
Read moreOrganize Digital Files Without Losing Them
Build a file system that is easy to maintain, use clear names, and keep an independent backup of important documents.
Read morePDF Conversion Went Wrong? Diagnose the Result Before Trying Again
Find common causes of rotated pages, missing text, larger files, cropped edges, wrong page order and changed signatures after PDF conversion.
Read morePDF to CSV with AI: check rows, values and missing data
A practical exercise for extracting a table with a reference CSV, leading zeros, decimal commas and an independent totals check.
Read morePrepare Documents for a University Application
A practical checklist for file format, legibility, naming, upload limits and proof of submission.
Read morePrepare Files for a Job Application
A practical guide to checking application instructions, organizing a résumé and certificates, preparing PDFs and keeping proof of submission.
Read moreWhat is OCR? How optical character recognition works
Learn how OCR turns text in images into machine-readable text, where errors happen and how to check results safely.
Read moreWhy PDF files are too large and how to reduce them
Find out what makes a PDF large, choose a suitable way to reduce it and check the copy before sharing.
Read moreImages and formats
14Color Converter: HEX, RGB and HSL
Convert opaque sRGB colors between hexadecimal, RGB and HSL formats in your browser, with a live color preview.
Open toolCompress images online: WebP, JPEG or PNG
Reduce image dimensions and create a WebP, JPEG or PNG copy in your browser. Compare file size before downloading.
Open toolConvert an image to grayscale online
Turn a color image into grayscale, preserve transparent areas and download a PNG in your browser.
Open toolConvert an image to PNG, JPG or WebP
Convert PNG, JPG, WebP, GIF or AVIF, choose an output format and adjust quality in your browser.
Open toolCrop an image online with a PNG preview
Select a rectangular area by its coordinates and dimensions, preview it and download a PNG copy processed in your browser.
Open toolExtract a color palette from an image
Find up to eight approximate colors in an image, view their HEX codes and copy or download the palette.
Open toolImage dimensions checker: size, aspect ratio and megapixels
Check an image’s pixel dimensions, aspect ratio, megapixels and file size in your browser.
Open toolResize an image online and keep its proportions
Change an image width or height, keep its proportions and download a PNG copy processed in your browser.
Open toolRotate or flip an image online
Correct an image orientation by rotating it 90, 180 or 270 degrees, or flipping it horizontally or vertically.
Open toolHow to choose image formats for a website
Compare WebP, JPEG, PNG and SVG for photos, graphics and transparency. Check image quality, compatibility and page experience.
Read moreHow to convert and share image files
Check file requirements, transparency, quality and size before converting an image for email, a form or another person.
Read moreImage tools: convert, resize and organize files
Choose image tools for PDF conversion, compression, resizing, format changes and cropping. Compare the result and keep the original.
Read moreJPEG, PNG, WebP or AVIF: How to Choose an Image Format
Compare image formats by compression, transparency, editing needs and compatibility before converting or publishing a file.
Read moreOnline photo editors: choosing the right tool
Compare browser-based photo editors for layered work, quick adjustments and graphic layouts. Check privacy, export formats and plan limits before uploading.
Read moreText and data
17Clean Extra Spaces in Text Online
Collapse repeated spaces and trim line edges, or turn text into one line. Processing stays in your browser.
Open toolCompare Two Texts Line by Line
Compare text versions line by line to find added, removed and unchanged lines. Input is processed in your browser.
Open toolConvert CSV to JSON
Convert CSV records to JSON objects with a header or arrays without one. Values remain text and are processed in your browser.
Open toolConvert JSON to CSV
Export a non-empty array of flat JSON objects as CSV, choose a delimiter and optionally neutralize spreadsheet formulas.
Open toolCreate a ZIP archive online
Combine up to 100 files into a ZIP archive in your browser without uploading their contents.
Open toolCSV Structure Validator
Check CSV quoting, delimiter, row widths and column consistency in your browser. Your text stays on your device.
Open toolFile Hash Generator: SHA-256, SHA-384 and SHA-512
Calculate a SHA-256, SHA-384 or SHA-512 digest for a local file in your browser without uploading its contents.
Open toolFind and Replace Text Online
Replace every literal text match, choose case sensitivity and see how many replacements were made. Text stays in your browser.
Open toolJSON Formatter and Validator
Validate JSON syntax and format it with two or four spaces, or compact it. Processing stays in your browser.
Open toolLorem Ipsum Text Generator
Generate placeholder text in paragraphs, sentences or words to test a layout.
Open toolRandom Password Generator
Generate a password in your browser with selected character sets and a length from 4 to 40 characters.
Open toolSlug Generator: Create Clean URL Slugs
Turn a title into a lowercase URL slug with Latin letters and numbers. Accent marks and punctuation are removed locally.
Open toolText Encoding Converter: Base64 and URL
Encode and decode text as UTF-8 Base64 or percent-encode a URL component. Runs in your browser.
Open toolURL Inspector: Parse an HTTP or HTTPS Address
Inspect a URL’s protocol, host, port, path, fragment and query parameters without opening the address.
Open toolUtilities to transform, count and organize text
Choose a tool for the format or task you need. Each link identifies the language of its page.
Open toolUUID v4 Generator: Create Random IDs in Your Browser
Generate 1–100 UUID v4 identifiers using your browser’s cryptographic random number generator; copy or download the list.
Open toolWrite numbers in Brazilian Portuguese words
Convert numbers and Brazilian real amounts into written Brazilian Portuguese, with a localized number input.
Open toolMath and conversions
41Area Converter: Square Metres, Hectares, Acres and Alqueires
Convert m², hectares, km², acres and regional Brazilian alqueire values with the conventions and limits explained.
Open toolBarbecue Food and Drink Calculator
Estimate barbecue meat, drinks, charcoal and sides from guest counts and event duration.
Open toolBrazil credit card revolving interest calculator
Simulate a Brazil credit-card balance with a monthly rate and the legal cap on interest and charges for eligible debts. See the assumptions and limits.
Open toolBrazil Financing Calculator: Price and SAC Systems
Compare estimated installments and interest under Brazil’s Price and SAC systems using Brazilian reais. A mathematical estimate, not a credit offer.
Open toolBrazilian CPF Format Checker
Educational checker for the 11-digit structure and check digits of a Brazilian CPF. It does not identify a person or query official records.
Open toolCalculate the grade needed on a final exam
Estimate the score needed on a remaining assessment to reach a target average, including weighted grades.
Open toolCalculation tools for study and everyday tasks
Choose a tool for arithmetic, fractions or unit conversion. Check each page for its method and limits.
Open toolCash discount or installments? Compare present value
Compare an upfront price with the present value of fixed installments using your estimated net monthly return. Educational BRL calculator, with no return guarantee.
Open toolCompare Files Locally by Their Bytes
Compare two files up to 100 MB each in your browser to check whether their bytes are identical.
Open toolDaily energy expenditure estimate
Estimate resting and total daily energy expenditure with the Mifflin–St Jeor equation. Approximate results are not a calorie target or medical advice.
Open toolDigital Storage Converter: Bytes, KB, MB, GB and TB
Convert bytes and storage units with the 1024 factor used by this calculator, and understand decimal versus binary capacity labels.
Open toolElectricity use calculator
Estimate an appliance’s energy use and cost from its power, daily use and your rate.
Open toolEnergy Converter: J, cal, kWh and eV
Convert joules, thermochemical calories, kilowatt-hours and electronvolts. See the factors, worked examples and the difference between power and energy.
Open toolFraction Calculator: Add, Subtract, Multiply and Divide
Calculate with two fractions, simplify the result and see the steps for addition, subtraction, multiplication or division.
Open toolFree converters for units and everyday tasks
Browse the available conversions and open the tool that fits your task. Each link identifies the language of its page.
Open toolFree QR code generator
Create and download a customizable QR code in your browser.
Open toolFreelance Hourly Rate Calculator
Estimate an hourly figure from a monthly income target, costs, an entered percentage and billable hours. A simple model, not tax advice.
Open toolInternet Speed Converter: Mbps, MB/s and More
Convert decimal bit and byte rates from Kbps to Gbps and from KB/s to GB/s, with examples that distinguish theoretical rate from real downloads.
Open toolLCM and GCD Calculator with Prime Factorization
Find the least common multiple and greatest common divisor of 2–8 positive integers, with prime-factorization steps.
Open toolLength Converter: meters, feet, inches and miles
Convert meters, centimeters, millimeters, kilometers, inches, feet, yards and miles with clear reference values and examples.
Open toolMultiplication table and practice tool
View multiplication facts from 1 to 100 and practice with randomly generated questions.
Open toolNumber Base Converter: Binary, Octal, Decimal and Hex
Convert non-negative integers between binary, octal, decimal and hexadecimal. Exact BigInt results, input validation and practical examples.
Open toolPaint calculator: estimate how many liters you need
Estimate paint from wall perimeter and height, openings, coats and the coverage stated by the product.
Open toolPercentage Calculator: Four Essential Calculations
Calculate a percentage of a value, find what percentage one number is of another, measure percentage change and reverse an increase or discount.
Open toolPercentage Increase and Decrease Calculator
Calculate the change and new value from an amount and a positive or negative percentage.
Open toolRandom decision maker and number picker
Get a random answer to a question or pick an integer from a range in your browser.
Open toolRandom number generator with range and no repeats
Draw random numbers from a range, choose how many to draw and optionally prevent repeats.
Open toolRemove Duplicate Lines from Text
Deduplicate a text list while keeping the first occurrence. Choose whether to ignore capitalization and edge spaces.
Open toolRoman Numeral Converter: Roman to Decimal and Back
Convert Roman numerals and decimal integers from 1 to 3,999, with canonical notation checks and examples.
Open toolRule of Three Calculator: Direct and Inverse Proportion
Solve direct and inverse proportions with a worked calculation. Check when the rule of three applies and when it does not.
Open toolSavings goal calculator: monthly contribution
Estimate the monthly contribution for a goal with a set deadline, starting balance and optional constant-return assumption.
Open toolShoe size converter: adidas chart by foot length
Compare foot length with the official adidas chart and view adult adidas US, UK, EU and JP size references.
Open toolSleep schedule calculator
Estimate bed and wake times with illustrative 90-minute blocks. Sleep cycles vary; this tool cannot predict your sleep stage or replace health guidance.
Open toolSort Text Lines Online: Natural and Reverse Order
Sort a list in ascending or descending order. Natural sorting understands numbers inside item names; empty lines can be removed.
Open toolTemperature Converter: Celsius, Fahrenheit and Kelvin
Convert temperatures between Celsius, Fahrenheit and Kelvin, with formulas, examples and the absolute-zero limit.
Open toolText Case Converter: Uppercase, Lowercase and More
Change text to uppercase, lowercase, title case or sentence case, alternate letters, reverse text and copy the result in your browser.
Open toolTile calculator: estimate floor area and boxes
Estimate floor area, a cutting allowance and box count from room dimensions and the coverage listed per box.
Open toolTime Zone Converter by City and Date
Compare city times for a specific date. Seasonal time rules are applied using the time-zone data available in your browser.
Open toolVolume Converter: Litres, mL, US Gallons and Cups
Convert litres, millilitres, cubic metres and clearly labelled US customary measures, including a separate 240 mL cup.
Open toolWeight and Mass Converter: kg, g, lb and oz
Convert kilograms, grams, pounds and ounces with clear unit labels, examples and customary-use notes.
Open toolWord and Character Counter
Count words, characters, sentences and paragraphs, and estimate reading time. Text stays in your browser.
Open toolFinance and planning
1150/30/20 budget calculator: divide take-home income
Estimate a 50/30/20 budget using monthly take-home income. Compare entered essential costs with the 50% reference; an educational framework, not financial advice.
Open toolBrazil 13th salary calculator: estimate pay and instalments
Estimate Brazil’s proportional 13th salary, two instalments and approximate INSS and IRRF deductions using 2026 tax tables.
Open toolBrazil net salary calculator: INSS and IRRF
Estimate monthly take-home pay for a Brazilian CLT employment relationship using the official 2026 INSS and IRRF tables. Approximate result; check your payslip.
Open toolBrazil vacation pay calculator: ⅓ bonus and leave allowance
Estimate paid leave for a Brazilian CLT employment relationship, including the one-third bonus, a possible 10-day cash allowance, and 2026 INSS and IRRF estimates.
Open toolCar trip cost calculator
Estimate fuel, tolls, total cost and cost per person using your own trip details.
Open toolCompound interest calculator with monthly contributions
Project a starting balance, monthly contributions, a monthly or effective annual rate, and a duration in months or years.
Open toolEmergency fund calculator
Estimate a reserve amount from monthly expenses and a time period you choose. A simple calculation with no assumed returns or financial advice.
Open toolEthanol vs gasoline price calculator
Compare local prices per liter using the approximate 70% rule. Actual fuel economy varies by vehicle and route.
Open toolFree tools for common financial calculations
Explore everyday estimates. Results are informational and do not replace personalized financial advice.
Open toolSimple interest calculator: formula and result
Calculate simple interest and the final amount from principal, a rate per period and the number of periods.
Open toolTip Calculator: Estimate and Split a Bill
Calculate a tip from any percentage, add it to a bill and divide the total equally among people.
Open toolDates and time
10Add or subtract days, weeks and months from a date
Add or subtract calendar days, weeks or months from a date and see the resulting weekday.
Open toolAge Calculator in Years, Months and Days
Calculate completed calendar years, months and days between a birth date and a reference date, plus total calendar days.
Open toolBrazil overtime pay calculator: 50% and 100% rates
Estimate overtime pay in Brazil using your monthly salary, monthly work-hour divisor and overtime hours at 50% or 100%, with an approximate weekly-rest effect.
Open toolBrazilian business days calculator
Count weekdays between two dates, excluding fixed Brazilian national holidays. Review the calendar limits before using the result for a deadline.
Open toolDate difference calculator: days, weekdays, years and months
Compare two dates to see elapsed days, weekdays including both dates, and the interval in years, months and days.
Open toolHours Calculator: Add, Subtract and Convert Time
Add and subtract h:mm entries, then convert between hours and minutes and decimal hours with clear examples.
Open toolOnline Stopwatch and Countdown Timer
Measure elapsed time, record laps or run a countdown with an alert in your browser.
Open toolSpeed Converter: km/h, mph, m/s, Knots and Mach
Convert road and wind speed units, with a clearly qualified approximate Mach reference.
Open toolUnix Timestamp Converter: Seconds, Milliseconds and UTC
Convert Unix timestamps to ISO UTC dates and convert dates with an explicit time zone back to seconds or milliseconds.
Open toolWorld Clock: Local Time in 18 Cities
See the local time and date in 18 cities using your browser’s IANA time-zone data.
Open toolWellbeing and education
7BMI calculator for adults: body mass index
Calculate body mass index from weight and height, view WHO adult reference categories and understand the limits of BMI. Screening information, not a diagnosis.
Open toolDaily Total Water Intake Reference
View EFSA reference values for total water intake in adults. They include beverages and water in food and are not personal targets.
Open toolDue date calculator for Brazil
Estimate a pregnancy due date from the first day of your last menstrual period. Learn why the result is approximate and when to consult prenatal care.
Open toolGuidance calculations for dates, sleep, activity and wellbeing
Review each tool’s limits. These calculations do not replace advice from a qualified health professional.
Open toolPet age calculator: compare dog and cat age
Compare a dog or cat’s age with an illustrative human-age chart. Choose species and, for dogs, adult size. This is not a medical measurement.
Open toolPregnancy weeks calculator for Brazil
Estimate gestational age from the first day of your last menstrual period and see an estimated due date. Learn what the calculation can and cannot tell you.
Open toolRunning Pace Calculator: finish time and speed
Estimate finish time from pace and distance, calculate the average pace for a target time, and see equivalent speed.
Open toolTechnology and artificial intelligence
2Weighted Average Calculator: Values and Weights
Calculate a weighted average from up to three value-and-weight pairs. See the formula, a worked example and common mistakes.
Open toolAI for documents: guides, practice files and sourced news
Learn how to use and assess AI with PDFs, images and tables through original guides, fictional examples and checked sources.
Read moreGuides and productivity
12Choose Clear File Names That Are Easy to Share
Use a short, readable naming pattern and follow the receiving service’s file requirements.
Read moreFrequently asked questions about ConverteArq tools
Answers about using the tools, files, privacy, limits and PDF documents.
Read moreHow to Choose Online Tools More Safely
A practical checklist for checking where a file is processed, what a tool says about privacy and when to avoid uploading sensitive documents.
Read moreHow to clean up a PC and improve Windows performance
A careful, practical Windows guide to diagnosing slowness, freeing disk space and managing startup apps without risky registry cleaners or guaranteed speed claims.
Read moreHow to Convert Files Without Unnecessary Quality Loss
Learn how lossy and lossless formats differ, when resizing changes an image, and how to keep a reliable original.
Read moreHow to extract audio from a video: tools, formats and rights
Compare online converters and desktop software, choose an audio format, and consider quality, privacy and usage rights.
Read moreHow to start a 3D printing business: services, costs and licensing
A practical guide to testing demand, quoting 3D printing work, counting material and labor, checking file permissions and understanding limits before investing.
Read moreHow to try recovering deleted files safely
Check backups and the Recycle Bin first. Learn what Windows File Recovery and PhotoRec can do, their limits, and why recovery is never guaranteed.
Read moreHow to use ConverteArq: a practical guide
Find tools, use calculators and file converters, and learn the privacy limits of ConverteArq.
Read morePDF tools: choose and check the result
A guide to ConverteArq PDF tools, file handling, limits and checks before use.
Read morePrepare images for WhatsApp or email without guesswork
Choose a suitable image size and format, check current attachment limits and compare the result before sending.
Read moreWhat Is Markup and Why Is It Used on the Web?
Learn how HTML, Markdown and XML mark up content, and why markup is different from data encoding such as Base64.
Read moreQuizzes and games
10🎤 ConverteArq Show – The Grand Prize
Recreational question and answer game by ConverteArq, created for entertainment and light learning without registration.
Open toolFantasy archetype quiz
A four-question entertainment quiz inspired by familiar fantasy figures. The result is symbolic, not a psychological assessment.
Open toolLandscape preference quiz
A four-question recreational quiz about landscape preferences. Its symbolic result is for fun, not a personality assessment.
Open toolPlanning style quiz
A three-question recreational quiz about planning preferences. Its symbolic result does not predict the future.
Open toolRecreational communication preferences quiz
Reflect on three everyday situations. This quiz does not measure love, trust or relationship health.
Open toolRecreational nature preferences quiz
Choose among three outdoor scenarios and get a light summary of the options you prefer. It does not measure personality or have spiritual meaning.
Open toolRecreational quiz: how do you like to recharge?
Answer three everyday scenarios to see what kind of break you prefer. For fun only: the result does not predict emotions or measure personality.
Open toolRecreational Zodiac Sign Quiz
Look up an approximate sun sign from a birth date and explore astrology’s symbolic elements. For entertainment, not science.
Open toolReflection style quiz
Answer three light questions about planning and routines. This recreational result does not measure mental age, personality or ability.
Open toolRelationship communication reflection quiz
Reflect on conversation preferences and agreements in three hypothetical situations. This quiz does not assess a relationship or reveal another person’s behaviour.
Open toolNo results found. Try another search or choose All.