Compress Image to 40 KB
Hit a 40 KB ceiling for ID photos, e-signatures and tight upload limits.
Your images stay on your device. Nothing is uploaded.
Some government forms enforce a 40 KB cap on attached photographs. The defaults below combine quality 0.42 with an 800 px max dimension to land safely under the limit while keeping the image legible.
Compression runs entirely in your browser — your photo never leaves your device.
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Frequently asked questions
- How do I compress an image to 40 KB?
- Upload your image and the default settings on this page are pre-tuned to land you around 40 KB. Use the quality slider to nudge the file size up or down — the result preview shows the exact byte count before you download.
- Will the image still look good at 40 KB?
- For most photos, yes. The pre-tuned quality and max-dimension settings prioritise visual quality while landing close to 40 KB. Very small targets (under 100 KB) on detailed images may need a visible quality reduction.
- Which format gives the best result for 40 KB?
- WebP usually produces the smallest file at a given quality, then JPEG, then PNG. The format selector lets you switch; the default reflects the best balance for 40 KB.
- Can I compress to exactly 40 KB?
- Browser compression is quality-driven, not byte-driven, so the resulting file size is close to — but not exactly — 40 KB. Staying under a target is what email clients, forms, and platforms enforce, so a slightly smaller file is always safe.
- Can I batch compress multiple images to 40 KB each?
- Yes — use the bulk compressor. Drop a folder of images and each one is processed with the same settings, then downloaded as a ZIP.
Hit your 40 KB target in one click.
Pre-tuned quality and dimension defaults land you close to 40 KB. No upload, no signup.
Start compressing