The image converter that never uploads your files
Convert between PNG, JPG, WebP, AVIF, HEIC, TIFF, BMP and ICO — entirely inside your browser. No account, no upload, no watermark. Works offline once loaded.
A converter that respects your files
Most “online” image converters quietly upload your pictures to a server, process them there, and hand back a download. That means waiting on your connection, trusting a stranger with your files, and hitting size or batch limits when the free tier runs out.
FavGrab takes the opposite approach: every conversion happens on your own machine. It uses the browser’s built-in Canvas APIs plus lazy-loaded WebAssembly codecs (libheif for HEIC, utif2 for TIFF, jSquash for AVIF) so your files never leave the tab. The result is faster, completely private, and free with no limits — convert one image or a hundred, online or offline.
Every format, both directions
Open these formats
PNG JPG WebP AVIF GIF BMP ICO HEIC HEIF TIFF
Save as
PNG JPG WebP AVIF BMP ICO
Popular conversions
What you get
Truly local
Nothing is uploaded — decoding and encoding run in your browser.
Batch + ZIP
Convert many files at once and download them as a single ZIP.
Quality control
A slider for lossy formats (JPG, WebP, AVIF) to balance size and clarity.
Optional resize
Cap the longest side in pixels, aspect ratio preserved, downscale-only.
Works offline
After the first visit the converter runs with no network at all.
Free & open source
No signup, no watermark, no paywall — and the code is on GitHub.
Frequently asked questions
Is this image converter really free?
Yes — completely free with no signup, no watermark, and no paid tier. Because conversions run in your browser there are no server costs to recoup, so there’s nothing to upsell.
Are my images uploaded anywhere?
No. Every image is decoded and re-encoded locally using your browser’s Canvas and WebAssembly. Your files never touch a server, which makes the tool both private and fast.
Which formats can I convert between?
You can open PNG, JPG, WebP, AVIF, GIF, BMP, ICO, HEIC, HEIF and TIFF, and export to PNG, JPG, WebP, AVIF, BMP or ICO. HEIC and TIFF decoders load automatically the first time you need them.
Can I convert multiple images at once?
Yes. Drop a whole batch, convert them in one pass, and download everything as a single ZIP archive.
Does it work offline?
Yes. After your first visit the converter is cached, so it keeps working with no internet connection at all.
Will converting reduce my image quality?
Lossless targets like PNG keep every pixel. For lossy targets (JPG, WebP, AVIF) you control fidelity with the quality slider, and the tool shows the resulting file size so you can pick the right balance.
Convert an image right now
Open the converter, drop your files, and download — nothing ever leaves your browser.
Open the converter →