Resize Signature Image Online
Resize your signature to the standard 300×80 px size used by most online forms and application portals. Free and instant.
Drop your image here
or or Browse files
JPG • JPEG • PNG • WebP
- Typical Size
- 300 × 80 px
- Aspect Ratio
- ~15:4
- Common Use
- Online Forms, Applications
How to use this tool
- 1Upload your signature image — JPG, PNG, or WebP are all supported.
- 2The tool is pre-set to 300×80 px. Adjust width/height if your target portal requires different dimensions.
- 3Turn off the aspect ratio lock if you need exact non-proportional dimensions.
- 4Click Resize Image and download your resized signature.
Supported Formats
Resizeify accepts JPG, PNG, WebP, and (on the HEIC converter page) HEIC/HEIF as input. You can export to JPG, PNG, or WebP regardless of the original format.
- JPG — smallest file size; ideal for photos, passport images, and any upload portal with a strict KB limit.
- PNG — lossless; best for screenshots, graphics with text, and images that need a transparent background.
- WebP — 25–35% smaller than JPG at the same visual quality; supported in all modern browsers.
Privacy Guarantee — Your Files Stay on Your Device
All resizing, compression, and format conversion runs entirely inside your browser using the HTML5 Canvas API. No image data, document content, or metadata is ever uploaded to any server. This includes sensitive files like passport photos, signature images, ID documents, and application form attachments. When you close the tab, all temporary data is discarded. Read our Privacy Policy.
Frequently asked questions
- What size should a signature image be for online forms?
- The most common requirement is 300×80 px at a file size under 30–50 KB. Some portals specify 140×60 px or 200×75 px. Check your specific portal's requirements and adjust the width/height fields accordingly.
- What format should a signature image be?
- JPG is the most widely accepted format for signature images. Some portals accept PNG, which preserves a transparent background if your signature has one.
- Can I use this for a transparent signature PNG?
- Yes. Upload your transparent PNG signature, switch the output format to PNG to preserve transparency, and resize to your target dimensions.
- Should I lock the aspect ratio for a signature?
- It depends. If your signature was scanned at an arbitrary size, you'll usually want to unlock the aspect ratio to hit the exact required pixel dimensions without distorting too much.
- Is Resizeify safe to use for sensitive documents, passports, and signatures?
- Yes, 100%. Resizeify operates entirely client-side inside your web browser. Your photos and documents are processed locally on your device and are never uploaded to external servers or stored anywhere.
More Preset Tools
Each tool opens with the right settings already configured.