Image Resizer in KB – Resize to 300×300, 300×80 or Any KB
Resize photos and signatures for online forms in one tap, or compress an image to 20 KB, 50 KB or 100 KB. Free, instant, no sign-up and no watermark.
100% Offline in Your Browser — Your personal photos & signatures never leave your device.
- No upload
- Instant
- Works offline
- No watermark
Step by step
How to Resize an Image in KB Without Uploading
- 1
Add your image
Drop a JPG, PNG, WebP or iPhone HEIC photo or signature on the box, paste it, or tap to pick it from your phone or computer.
- 2
Pick a size
Tap a form, passport or social media size, or type any width and height in pixels, percent, cm or inches. Rotate or flip it if needed.
- 3
Set a KB limit
Choose Under 20, 50, 100 or 200 KB, or type your own. The quality is tuned automatically to fit.
- 4
Download
Check the before and after sizes, then download. The image is made on your device and never uploaded.
Size guide
Standard Online Application Photo & Signature Sizes
Most job, exam, university, bank and ID portals ask for one of these sizes. Always check the exact numbers on the form you are filling in, then set them here.
| Upload | Size in pixels | Usual file size | Tip |
|---|---|---|---|
| Passport-style photo | 300 × 300 px | 20 – 100 KB | Use the 300 × 300 preset; it crops to a neat square. |
| Signature | 300 × 80 px | 10 – 50 KB | Sign in black ink on white paper; the preset keeps the whole signature. |
| Passport / visa photo | 413 × 531 px (35 × 45 mm) | Under 100 – 200 KB | 35 × 45 mm at 300 dpi; face centred, plain background. |
| US passport / visa photo | 600 × 600 px (2 × 2 in) | Under 240 KB | Use the 2 × 2 inch preset; choose Keep top so the head isn't cut. |
| Photo by width only | e.g. 600 px wide | Under 200 KB | Keep the ratio lock on so the photo isn't stretched. |
| Social media post | 1080 × 1080 or 1080 × 1350 px | No limit | Square or portrait crop for Instagram and Facebook. |
| Story, Reels or Status | 1080 × 1920 px | No limit | Tall 9:16 crop for Instagram, Facebook and WhatsApp. |
| YouTube thumbnail | 1280 × 720 px | Under 2 MB | Wide 16:9 crop; JPG keeps it small. |
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Why resizing without uploading matters
- Your photo, signature and ID are among the most sensitive files you own. Most online resizers upload them to a server; this one does all the work inside your browser.
- Once the page has loaded, resizing even works offline, and it is instant because nothing has to travel over the internet.
- No account, no email, no watermark and no limit on how many images you resize.
Free Android app
JaxScan: the private scanner in your pocket
Scan, compress, convert, sign and protect documents offline on your Android phone, without uploading a single page.
- No account
- No ads
- No cloud upload
- Works offline
- Fingerprint app lock
Scan to PDF in seconds
Auto edge detection and 10 filters that lift shadows and turn paper bright white. Batch-scan a whole stack into one PDF.
ID card photocopy
Front and back on one printable page, like a photocopy, ready for any job, bank or visa application.
Offline OCR in many languages
Copy text from any photo: English, Spanish, French, German, Hindi, Chinese, Japanese, Korean and more, even in airplane mode.
Sign, redact & lock
Draw your signature once and reuse it, black out private details for good and lock PDFs with an AES-256 password.
Complete PDF toolkit
Merge, split and compress PDFs, add page numbers and watermarks, and convert to Word, PowerPoint and images.
QR & barcode scanner
Join Wi-Fi, open links, save contacts and events in one tap, with a full scan history.
FAQ
Image Resizer: Frequently Asked Questions
How do I resize an image to 300 × 300 pixels?
Add your photo, tap the 300 × 300 px preset and download. The photo is cropped to a perfect square, so nothing is stretched; choose Keep top if the head is near the top of a tall photo. If your form also has a KB limit, tap Under 50 KB or Under 100 KB before you download.
How do I reduce an image to 20 KB or 50 KB?
Add the image and choose Under 20 KB or Under 50 KB (or type any number in the Custom box). The tool finds the highest quality that fits under the limit and shows the exact size before you download. JPG gives the best quality for small file sizes.
How do I resize my signature to 300 × 80 pixels?
Take a clear photo of your signature in dark ink on white paper, add it here and tap the 300 × 80 px preset. The whole signature is kept and centred on a white background. Most forms want it under 20 KB to 50 KB, so pick that limit too.
What is passport size in pixels?
A 35 × 45 mm passport photo is 413 × 531 pixels at 300 dpi, which is what the Passport size preset makes. Many online forms instead ask for a 300 × 300 px square; check the size your form asks for.
How do I resize a photo to 3.5 × 4.5 cm or 2 × 2 inches?
Under Custom size, choose cm or Inches and type the size, for example 3.5 × 4.5 cm. Pick the print resolution (300 DPI suits photo labs and most forms) and the tool shows the exact pixels, here 413 × 531 px. For US passport and visa photos, tap the 2 × 2 inch preset.
Can I resize iPhone HEIC photos?
Yes. Add the HEIC photo as it is: Safari opens it directly, and other browsers convert it to JPEG on your device first. Then resize it and download it as JPG, PNG or WebP.
Are my photos uploaded or saved anywhere?
No. Resizing happens entirely in your web browser using your own device, so your photos and signatures never leave it: 0 bytes are uploaded and nothing is stored. You can even use it offline once the page has loaded.