Convert images
Change an image from one format to another. Drop in a whole folder, pick the output format, done — the conversion happens on your machine, not on a server.
How to convert images
- Drop your images onto the panel above, or click it to browse. You can add as many as you like.
- Pick the format you want under Convert to. For JPG and WEBP, set the quality — 88% is a good default that is visually indistinguishable from the original for most photos.
- If you are converting a transparent PNG to JPG, choose what the transparency should become. JPG has no transparency, so it has to be filled with something; white is the usual answer.
- Press Convert. A single file downloads immediately; several files give you a Download all (.zip) button.
Why this one is different
Almost every free file tool works the same way: you upload your file to a company's server, their machine does the work, and you download the result. That means a copy of your document sat on someone else's hard drive, governed by a privacy policy you did not read.
Filebench does the work in the browser tab you are already looking at. There is no upload step because there is no server to upload to. The practical consequences: no file size limit, no queue, no account, no watermark, and it keeps working if your connection drops after the page loads.
| Filebench | Typical online converter | |
|---|---|---|
| Your file leaves your device | Never | Every time |
| File size limit | None | Often 10–100 MB free |
| Sign-up required | No | Usually, past a few files |
| Watermark on output | No | Sometimes |
| Works offline after loading | Yes | No |
Questions
Is there a file size limit?
No. The work is done by your own browser, so the only real limit is your device's memory. Files of several hundred megabytes are fine on a normal laptop; very large batches are processed one image at a time to keep memory use low.
Are my images uploaded anywhere?
No. There is no server involved in the conversion. The page loads once, and after that every image is read, decoded and re-encoded inside your browser tab. You can disconnect from the internet after the page loads and the tool still works.
Which format should I choose?
JPG for photographs you need to work everywhere. PNG when you need transparency or crisp text and line art. WEBP when file size matters most — it is typically 25–35% smaller than JPG at the same visual quality, and every current browser supports it.
Why did my PNG get bigger when I converted it to PNG?
PNG is lossless, so re-encoding cannot make a well-optimised file smaller and may make it slightly larger if the original used a more aggressive compressor. To actually reduce a PNG, use the compressor and output WEBP or JPG.
Does converting lose quality?
Converting to PNG does not — it is lossless. Converting to JPG or WEBP re-compresses the image, so some data is discarded. At 85–95% quality this is invisible in normal viewing. Repeatedly converting the same file back and forth does accumulate loss, so work from the original where you can.
Other tools
Compress images
Cut image weight with a quality slider and an optional size cap. Each result shows the percentage saved.
Resize images
Resize by width, height, exact dimensions or percentage — in bulk, with the aspect ratio kept.
Images to PDF
Combine images into one PDF with A4, Letter or fit-to-image pages and drag-to-reorder.