Compress any image to 5KB or less automatically. For the most restrictive legacy portals, signature uploads and applications requiring the smallest possible file size above 1KB.
For best results at 5KB, ensure your image is already small — ideally under 100×130 pixels for photos or 140×60 pixels for signatures. The smaller the source dimensions, the better quality the tool can achieve within the 5KB limit.
Drop your image onto the tool. The binary search algorithm tests quality levels to find the highest quality that keeps the output at or under 5KB. Results are ready in under a second.
Use the comparison slider to inspect the result. At 5KB, quality is significantly limited for large images. If the quality is insufficient, reduce source dimensions and try again. Download when satisfied.
The 5KB limit is found on some very old government portals, certain legacy banking and insurance systems, and some older competitive exam registration portals. It is less common than 10KB or 20KB but exists on platforms built in the early 2000s that have not updated their upload constraints.
A 100×130 pixel photo at 5KB achieves approximately JPEG quality 40–60, which is usable for document identification purposes. A signature image at 140×60 pixels can reach quality 70–80 at 5KB, appearing reasonably sharp. Larger images will require lower quality settings and will show visible compression artefacts.
Yes — strongly recommended. Resize your image to the exact dimensions required by your target portal before compressing. Most portals that enforce a 5KB limit will also specify small dimensions (e.g. 100×130 pixels). Matching those dimensions exactly gives you the best quality within the file size budget.
Yes — signatures compress very efficiently at 5KB because of their simple black-on-white content. A 140×60 pixel signature at 5KB typically looks crisp and clear, making this tool ideal for exam portals that require both a photo and a signature with separate size limits.
10KB allows roughly double the data per pixel compared to 5KB, resulting in noticeably better quality at the same dimensions. If your portal allows 10KB, use the 10KB compressor instead for meaningfully better results. Use 5KB only when the portal specifically requires it.
Yes — the tool runs entirely in your mobile browser on iOS Safari and Android Chrome. Take your photo, upload it, compress to 5KB, and the downloaded file goes to your Files app (iOS) or Downloads folder (Android). No app installation required.
