All tools are provided for informational and educational purposes. Processed data is stored fully inside your browser memory and never uploaded to our servers.
Compress Image to 20KB
Last updated
Compressing an image under 20KB satisfies strict government form specifications for signatures and small ID photos. The browser-native engine automatically optimizes resolution and compression quality down to below 20,000 bytes while keeping text and line strokes distinct. Your personal signature and photo never leave your device or touch a remote server.
Compress your candidate signature or photo to 20 KB or less in one step. Set up for forms that cap scanned signatures at 20 KB, such as SSC and IBPS (both ask for 10–20 KB).
Runs in your browser
Your files and text are processed locally in your browser and are not uploaded.
How Do I Compress an Image to Exactly Under 20KB?
- Select your signature scan or candidate photo and upload it into the tool.
- Confirm the Under (Max) KB setting is active with the target set to 20 KB.
- Select JPEG output format to ensure compatibility with exam portal upload scripts.
- Click Compress to Exact Target to run the local optimization engine.
- Check the result card showing file size in bytes and final pixel dimensions.
- Click Download Compressed Image to save your file.
The Standard 20 KB Ceiling Across Indian Examinations
20 KB is a common upper limit for scanned signatures. Two current examples from official notifications: - SSC CGL 2024: signature in JPEG/JPG, 10 to 20 KB, about 6.0 cm wide × 2.0 cm high - IBPS CRP PO/MT-XVI: signature 10 to 20 KB, 140 × 60 pixels preferred
Both also set a 10 KB minimum, so if your notice gives a range, use the 10–20 KB signature page instead.
Maintaining Ink Stroke Contrast and Detail
A candidate signature must be clearly legible on admit cards and attendance sheets. If a signature is poorly compressed, automated verification systems may flag the application, or invigilators may challenge your identity at the examination center.
The engine enforces a hard ceiling of 20,000 bytes and keeps JPEG quality at 60% or higher by shrinking the image, which keeps ink strokes clean. It does not change contrast, so start from a well-lit scan.
Crucial Preparation Steps Before Compressing
Follow these preparation tips for a flawless 20 KB signature: - Use a black ink pen on clean, unruled white paper (blue ink often turns faint after downsampling) - Crop tightly around the signature to remove desk surface and shadow - Do not sign in CAPITAL LETTERS for IBPS: the notification says such signatures are not accepted - Use our tool's exact dimensions option if your notice specifies dimensions such as 140 × 60 pixels
Frequently asked questions
Why does the tool compress to 19.5 KB instead of exactly 20.0 KB?
The engine enforces a hard ceiling of 20,000 bytes (19.53 KiB). Many portal upload validators calculate 1 KB as 1,000 bytes and reject files exceeding 20,000 bytes. Staying under 20,000 bytes passes both ways of counting a kilobyte.
Can I compress a photograph to under 20 KB?
Yes. If your examination or state portal mandates candidate photos under 20 KB, the engine will scale the photo dimensions down and preserve clear facial outlines.
What should I do if my signature looks faint after compression?
Faint signatures usually occur when photos are taken in weak indoor light. Sign with a bold black pen on bright white paper in daylight, crop out extra white space, and re-compress.
What if my portal requires between 10 KB and 20 KB?
Use our dedicated Resize Signature 10KB to 20KB tool. It enforces both the 10 KB floor and the 20 KB ceiling simultaneously.
Will my JPEG be uploaded to a server?
No. The image is compressed inside your browser using JavaScript and HTML5 Canvas, so it never leaves your device. That makes it safe for ID proofs, signatures, certificates and other personal documents.
What if my image is still above 20 KB?
Very large or highly detailed images may need smaller dimensions to fit under 20 KB. The tool automatically downscales dimensions while keeping JPEG quality crisp. You can also switch output format to WebP, which produces smaller files at high visual quality.
Exam Photo & Signature Sizes
Need a different size? Use the full Image Compressor.