FOLIOTERN · Images

Resize and compress images online

Fit JPEG, PNG and WebP images inside a maximum width and height while keeping their aspect ratio. Download one image or a batch ZIP.

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Local processing · no card needed
01

Choose ordinary image files

Add JPEG, PNG or WebP images. Up to 20 files can be processed together within the stated byte and pixel limits.

02

Set size and quality

Choose a bounding box and format. Images are never enlarged. JPEG and WebP use the quality setting; PNG remains lossless and ignores it.

03

Check the measured result

The result shows actual before/after file sizes and output dimensions. Some format changes create larger files, so use the reported sizes rather than assuming a saving.

Know what to expect

Metadata is not retained. Animated files, RAW, HEIC and SVG are not supported; colour-critical work needs a dedicated review.

Source files stay in the current browser page and clear on reload. Save the output before leaving, and retain original files for important work.

Read the file guide
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