Convert images, PDFs, documents, spreadsheets, audio, and video between 50+ formats directly in your browser. No upload, no account, no waiting for an email. Files never leave your device — Culacc has no copy. Works on any device with a modern browser.
Images — JPG, JPEG, PNG, WebP, GIF, BMP, ICO. Convert between any of them.
PDFs — convert to TXT, HTML, Markdown, JPG, or PNG. Multi-page PDFs become a ZIP of images, one per page.
Documents — DOC and DOCX convert to PDF, HTML, Markdown, or TXT.
Spreadsheets — XLS and XLSX convert to CSV, HTML, PDF, or TXT.
Video — MP4, WebM, AVI, MOV, MKV, and GIF. Convert between any of them or turn short clips into animated GIFs.
Audio — MP3, WAV, OGG, AAC, FLAC, M4A. Convert between any of them.
Most online file converters upload your file to a server, convert it there, and email or stream the result back. That works, but it means your photos, contracts, recordings, and documents pass through someone else's infrastructure — often with vague retention policies and ads everywhere. This converter runs entirely in your browser. Image and document conversions use native browser APIs. Video and audio conversions use FFmpeg compiled to WebAssembly. Either way, your file never travels over the network.
No. Image, document, PDF, and text conversions run locally using your browser's JavaScript engine. Video and audio conversions use FFmpeg compiled to WebAssembly — also entirely in your browser. Files never leave your device.
Because your phone is doing the work, not a server. FFmpeg-on-WebAssembly is fast, but mobile CPUs are slower than desktops. For large videos (over ~100 MB), a desktop browser is significantly quicker.
Yes. Pick JPG or PNG as the target format. Each page becomes a separate image and all images are packaged into a single ZIP file for download.
Browser memory is the only constraint. Most files under 500 MB convert without issues. Very large videos may take a minute or two on slower devices.
Producing valid DOCX or XLSX files in the browser is technically possible but unreliable for complex layouts. We'd rather not offer something that breaks formatting silently. For now, conversion into Office formats happens server-side in Culacc accounts, where ONLYOFFICE handles it properly.
Yes — make a free Culacc account (5 GB, every feature unlocked) and use the Save to my Culacc button. The converted file lands in your storage, available on every device you sync.