FluffyBench

Convert thousands of photos without uploading them

Free browser tools. No uploads, no sign-up, no usage quotas, no watermarks. Convert photos on your own device, plus unit, text and developer tools.

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We gave 13 converters the same 10,000 photos. Only FluffyBench finished.

One job for every tool: convert 10,000 photos, including 500 iPhone HEIC files, to WebP. The others crashed, stalled or stopped at a free limit.

  1. FluffyBenchFinished in 22 min 2 s
    10,000
  2. 4 convertersRan out of memory and crashed
    0
  3. 3 convertersStill unfinished after 110 min, stopped
    0
  4. 3 convertersStopped at a free limit: 15 files, 20 files or 10 minutes a day
    ≤ 15
  5. 2 convertersTake one photo at a time
    1per upload

FluffyBench peaked at 3.4 GB of memory; three of the converters that crashed used 19–34 GB first. It converted all 500 HEIC photos; five converters dropped them without a message.

Tested 11 October 2026 in Chrome 155 on Windows 11 (Ryzen 9 5950X, 128 GiB memory), with the PC in normal use. 10,000 photos (8,500 JPG, 1,000 PNG, 500 HEIC; 34.9 GB) to WebP at quality 80%, at each tool’s fastest reasonable setting. A tool still running at 5× FluffyBench’s time was stopped. Two more couldn’t be compared: one has no WebP output, and one wouldn’t run on the test PC. How we tested

How your data stays private.

Beyond local processing, FluffyShield isolates selected files and protected tool data from the rest of the page.

FluffyShield Isolated

FluffyShield protects your files and processed data. Nothing inside shielded tools is ever exposed to the rest of the site.

What FluffyShield protects
Where the work happens Your photo goes into FluffyBench on your own device and comes out as your result on the same device. The path to an upload server is crossed out. Your device Your photo FluffyBench runs the tool here Your result No upload server

Free because of ads, and ads never see your files

Advertising, analytics and unrelated page code never receive selected files, results or protected tool data. Tools run in a separate workspace that loads no advertising.

Privacy policy

Zero logging

FluffyBench does not create application logs containing your files or private tool activity, store selected-file data, or set cookies of its own. Ad cookies are explained in the privacy policy.

No account, nothing to install

Open a tool in any modern browser and start. There is no daily or per-account limit on conversions; a very large batch is limited by your browser, your device’s memory and the files themselves.

It opens files your browser can’t

iPhone HEIC photos, camera RAW, Photoshop PSD and JPEG XL open and convert here.

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Looking for something else?

Try “heic”, “kb to mb” or “base64”.

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