Photopea

Promptfree, for everyone, and the only version there is

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Do not build this. Reading proprietary file formats is the product, and it is reverse engineering plus years of edge cases.

Opening a layered Photoshop file correctly — adjustment layers, masks, blend modes, smart objects, text with the right font metrics — is a large body of work against a format that was never documented for this purpose. That, in a browser, is the thing.

WHAT TO DO INSTEAD
- Keep it. It is a few euros and it opens files nothing else free will
- GIMP or Krita for local editing, both free and both capable, if you do not need the proprietary formats

WHAT YOU CAN BUILD, AND SHOULD

**The image operations you actually repeat**, which are almost never editing:
- Resize to the sizes actually used, with a good resampling kernel. Serving a 4000-pixel image into a 400-pixel slot is the largest waste on most sites
- Convert to AVIF or WebP with a fallback, at a perceptually measured quality rather than a fixed number — encode at several qualities, measure against the original, and keep the smallest that stays above a threshold
- Strip metadata, including the location an ordinary phone photograph carries
- Crop to a set of aspect ratios from a stored focal point, so a subject stays in frame
- Batch over a directory, cached by content hash so nothing is re-encoded twice
- All of that is sharp and a couple of hundred lines, and it is under TinyPNG elsewhere in this catalogue

AND THE ONE THAT REPLACES A DESIGN TOOL ENTIRELY
If you are opening an editor to make the same card over and over — a share image, a quote graphic — that is a template, not a design task. Render it with satori and resvg from a small object, with text fitted by binary search rather than by eye. Faster than any editor once it exists.

THE ONE-LINE VERSION
Keep the editor for the files nothing else opens. Script the operations you repeat, and template the images you remake.