About OnlyFiles

OnlyFiles is a free online tool for converting and compressing files. Documents, images, audio — drop a file, pick a format, download the result. No signup, no watermarks, no ads.

Privacy first

Most conversions on OnlyFiles happen entirely in your browser. When you convert an image — say, PNG to JPG or HEIC to JPG — your file never leaves your device. It's processed using your browser's built-in capabilities and the result is generated locally.

For conversions that need server-side tools (like DOCX to PDF or MP3 to WAV), your file is uploaded to a secure server, processed, and deleted immediately. Nothing is stored. Nothing is logged.

What you can do

Convert documents: Word to PDF, PDF to Word, PowerPoint to PDF, PDF to images. Convert images: between PNG, JPG, WebP, BMP, GIF, SVG, and HEIC (iPhone photos). Convert audio: MP3 to WAV and WAV to MP3. Compress files: shrink PDFs, images, Word documents, and PowerPoint presentations with three compression levels — Light, Balanced, and Strong.

How it works

The frontend is a static site that loads instantly. Image conversions use the browser's Canvas API. HEIC conversion uses the heic2any library. PDF-to-image conversion uses pdf.js. All of these run client-side with zero server involvement.

Document and audio conversions use a backend running LibreOffice, FFmpeg, and Ghostscript inside a Docker container. Files are uploaded over HTTPS, processed in a temporary directory, and deleted within seconds. The server enforces rate limiting and file type validation.

Why OnlyFiles exists

Every file converter online is either slow, covered in ads, requires signup, adds watermarks, or all of the above. OnlyFiles was built to be the tool you actually want to use: fast, clean, free, and private. Drop a file, get the result, move on with your day.

Built in public

OnlyFiles is built by @kimtriestobuild on Twitter. Follow along to see what's being built next.