How to resize an image
- Choose your photo. Tap the box to pick one from your gallery or camera, or drag a file onto it.
- Pick a preset, or set the size yourself. Use Pixels for exact dimensions, Percent to scale down or up, or File size only to keep the dimensions and shrink the file.
- Crop if needed. Choose a shape such as 1:1 or passport, then move the box over the part you want to keep.
- Set a maximum file size if a form gives one, for example 20 KB or 50 KB.
- Download. The before and after sizes show that the file fits.
Photo and signature sizes for online forms
Exam, job and government application forms often ask for a photo and a signature within fixed limits. Each form sets its own rules, and they change, so always check the official notice. The presets match the most common requests:
| Preset | Dimensions | File size | Typical use |
|---|---|---|---|
| Passport photo | 413 × 531 px (3.5 × 4.5 cm at 300 DPI) | No limit set | Passport-style photos for forms and ID cards |
| Signature | 140 × 60 px | Under 20 KB | Scanned signatures on application forms |
| Under 20 KB | Kept, reduced only if needed | ≤ 20 KB | Strict photo or signature limits |
| Under 50 KB | Kept, reduced only if needed | ≤ 50 KB | Many exam and recruitment portals |
| Under 100 KB / 200 KB | Kept, reduced only if needed | ≤ 100 or 200 KB | Email attachments and document uploads |
If a form asks for a different size, such as 200 × 230 px under 50 KB, choose Pixels, enter the width and height, and type 50 in the max file size box.
How the file size target works
Pixel size and file size are different things. A 413 × 531 photo can be 15 KB or 150 KB depending on how much it is compressed. When you set a maximum file size, the tool:
- Saves the image at high quality and checks the size.
- If it's too big, searches for the highest JPEG or WebP quality between 30% and 95% that fits.
- If even 30% quality is too big, reduces the width and height a step at a time and searches again.
Some websites count 1 KB as 1,000 bytes and others as 1,024 bytes. The tool aims under 1,000 bytes per KB, so the file passes either check. The exact byte count is shown after resizing.
PNG is lossless and has no quality setting, so for a PNG the tool can only reduce the dimensions. For strict limits, choose JPEG.
Crop to the right shape
Resizing with "Keep aspect ratio" switched off stretches or squashes a photo when the shape changes. Cropping avoids that. Pick the shape first (for example 35:45 for a passport photo or 1:1 for a profile picture), drag the box so your face or signature is centred, then resize. On a phone, drag with one finger; the blue corner changes the box size.
Tips for sharp results
- Start from the original photo, not a copy that has already been shrunk or sent through a chat app.
- For signatures, sign with a dark pen on plain white paper and photograph it in daylight. Crop tightly around the signature before resizing.
- Enlarging a small image (above 100%) can't add detail; it will look soft.
- To shrink many photos at once, use the image compressor. To put scanned pages into one file, use JPG to PDF.
Private: nothing is uploaded
The photo is resized in your browser using its built-in canvas. It is never sent to a server, which matters for ID photos and signatures. Re-encoding also removes EXIF metadata such as the GPS location and camera model.
Frequently asked questions
How do I resize a photo to 20 KB?
What is the passport photo size in pixels?
Will resizing reduce the quality?
Are my photos uploaded?
Why can't PNG reach my file size limit?
Does it remove EXIF and location data?
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