Free online tools for the files you actually work with.

Convert, compress, merge and edit PDFs, images, video, audio and text. No account, no watermark, no upload for 145 of the 167 tools.

Browser-first processing
Server files deleted automatically
167 tools

Common file jobsAll tools

Most tools run locally — your files stay on your device.

145 browser tools · 22 server tools

The short version

What is FormatFlow?

FormatFlow is a free online toolbox for everyday file work. It gathers 167 tools across 12 categories — PDF, image, video, audio, text, developer, YouTube, calculator and four science groups — in one place, with no account required and no upload for browser tools. Most PDF, image, text, developer and calculator tools run entirely in the browser, so the file never leaves the device; video and audio conversions use FFmpeg on a temporary server copy that is deleted after download, with a 100 MB upload limit and a three-minute processing cap. Every tool page states the supported formats, limits and privacy behaviour before you start. The library covers converters, compressors, editors, calculators and reference guides, including Spanish and Portuguese pages for the most-used tools. All tools are free, have no watermark, and are reviewed against the working implementation.

How the site is built Browse all 167 tools Read the 65 guides

Popular tools

The jobs people open FormatFlow for most often.

All 167 tools

01YouTube Thumbnail DownloaderThumbnailsDownload YouTube thumbnails in maxres, sd, hq, mq and default size from a watch, share or Shorts link.02QR Code GeneratorText/URL → PNGCreate QR codes for text, links, Wi-Fi networks or emails.03JPG to PDFJPG/JPEG → PDFConvert JPG images to PDF free in your browser.04PDF to WordPDF → DOCXConvert PDF to Word free in your browser.05Password GeneratorPolicy → PasswordGenerate strong random passwords from 8–64 characters with lowercase, uppercase, digits, symbols and ambiguous-character filtering.06Image CompressorJPG/PNG → JPG, PNG or WebPCompress JPG, PNG and WebP images online for free.07Percentage CalculatorPercentagesCalculate X% of Y, find what percent X is of Y, and measure percentage increase or decrease.08Merge PDFPDF → PDFMerge PDF files free in your browser.09HEIC to JPGHEIC → JPGConvert HEIC to JPG online for free.10MP4 to MP3MP4/M4V → MP3Extract MP3 audio from MP4 videos online for free.11Compress Image to SizeJPG/PNG → JPG or WebPCompress a JPG, PNG or WebP image to a target size such as 20, 50 or 100 KB.12Compound Interest CalculatorCompound growthCalculate compound interest with a starting balance and monthly contributions.13Tip CalculatorTip and splitCalculate the tip, total and per-person share for any bill.14YAML to JSONYAML → JSONConvert YAML to JSON online in your browser.

Browse by category

12 families of tools, each with a short guide to the formats behind it.

PDF ToolsConvert, merge, split and shrink PDFs24 tools Image ToolsConvert, compress, resize and crop photos17 tools Video ToolsConvert, compress and turn clips into GIFs15 tools Audio ToolsExtract and convert MP3, WAV and M4A8 tools Text ToolsCount and check words as you write8 tools Developer ToolsFormat JSON and encode Base64 locally17 tools YouTube ToolsThumbnails, embeds and cleaner snippets4 tools CalculatorsPercentages, age, BMI and loan maths9 tools Physics ToolsCircuits, motion, forces and energy19 tools Chemistry ToolsFormulas, solutions and moles17 tools Biology ToolsGenetics, sequences and microscopy17 tools Scientific ToolsSignificant figures, notation and units12 tools

Built for the messy middle of file work.

Your files stay yours

145 of 167 tools process files inside your browser. Nothing is uploaded, logged or copied. The 22 media tools use a temporary server job that is deleted when the download finishes.

Limits are published

Every tool page states its real maximum size, supported formats and known limitations before you start. No surprise paywall after a five-minute upload.

Content, not ad clutter

Tools sit beside short format guides and honest FAQs. Ads are clearly labelled and kept away from convert and download buttons — the tool is the product here.

Understand the formats

65 original guides to the formats, trade-offs and failure modes behind the tools.

All 65 guides

fundamentals

Lossy vs lossless compression, explained

Every quality slider is a trade between file size and fidelity. This guide explains both compression families, where each is used, and how to avoid losing the same quality twice.

5 min read

formats

HEIC vs JPG: which photo format should you keep?

Your iPhone saves HEIC while most cameras and websites expect JPG. One is smaller and stores more colour; the other opens everywhere. Here is how the two formats differ, and when converting actually helps.

5 min read

how-to

Why your video won't play (and how to fix it)

Playback failures usually come from the codec or the container rather than a damaged file. Here is a practical order for diagnosing the problem, and what conversion can and cannot fix.

6 min read

Before you start

Straight answers about pricing, privacy and what happens to your files. More questions? Ask us.

What is FormatFlow?

FormatFlow is a free online toolbox with 167 tools for PDF, image, video, audio, text, developer, YouTube, calculator and science tasks. Most run entirely in your browser without uploading a file; video and audio conversions use a temporary server copy that is deleted after download.

Who reviews the tool pages?

FormatFlow Editorial reviews every page against the working implementation: supported formats, limits, privacy claims and failure modes are checked against the code rather than written independently. Corrections can be sent to hello@formatflow.online.

Is FormatFlow really free?

Yes. All 167 tools are free to use without an account, a watermark or a daily limit. The site is funded by clearly labelled advertising placed around the tools, never inside the files you download.

Do you store the files I upload?

Browser-based tools never upload anything — the file is processed in your tab. The 22 video and audio tools use a temporary server directory that is deleted automatically after your download; nothing is kept in long-term storage.

Do I need to create an account?

No. There is no sign-up, no email address required and no download counter. Open the tool, convert your file and close the tab when you are done.

Which tools run in my browser?

145 of the 167 tools run entirely in your browser, including every PDF, image, text, developer and calculator tool. Only video and audio conversion uses our servers, because re-encoding media needs more compute than a browser tab can reliably offer.

Why is there a file size limit?

Every tool publishes its real limit instead of failing silently. Browser tools are bound by the memory available to your tab, and server-side video/audio jobs are limited to 100 MB per upload so that conversions stay fast and reliable.

Can I use FormatFlow on my phone?

Yes. The site is built mobile-first, so every tool works in a phone browser. HEIC photos from an iPhone can be converted to JPG or PNG directly in Safari or Chrome without installing an app.