Guides
How to resize a picture for anything
Short, practical guides for the jobs people resize photos for most — each one with a link that opens the resizer already set up. Free, in your browser, nothing uploaded.
Compress image online without losing quality
Pixels first, quality second: turn a 4 MB phone photo into 300 KB that looks the same, or compress to 100 KB, 500 KB or 1 MB, with a before / after preview.
Read the guideResize an image to 20 KB, 50 KB, 100 KB…
Exact file-size limits for forms, exams, visas, job sites and e-mail — and which pixel size fits which limit.
Read the guideResize photo and signature for online forms
Photo 20–50 KB, signature 10–20 KB, 3.5 × 4.5 cm or 200 × 230 px: get both files accepted by exam, job and government application forms.
Read the guidePassport photo size and resizer
2 × 2 in, 35 × 45 mm, 600 × 600 px and the rules for the US, UK, EU, India, Canada, China and more — at 300 DPI, under the KB limit.
Read the guideSocial media image sizes 2026 — resize for Instagram
Instagram, Facebook, X, LinkedIn, YouTube, TikTok, Pinterest and WhatsApp sizes in one table, each with a one-click resizer.
Read the guideResize a photo for printing
4 × 6, 5 × 7, 8 × 10, A4 and more in pixels at 300, 200 and 150 DPI; what DPI really means; how to stop the lab cropping your photo.
Read the guideCrop a photo — square, circle or any ratio
Lock the frame to 1 : 1, 4 : 5, 16 : 9 or 9 : 16, cut out a circle with a transparent background, or crop to exact pixels.
Read the guideHEIC to JPG
Open an iPhone photo, save it as JPG (or PNG / WebP), resize it and keep it under a KB limit in one step. Nothing is stored.
Read the guideQuick answers
The numbers people look up most
Straight from the guides — click through for the rest.
| Question | Answer | Guide |
|---|---|---|
| Pixels for a 2 × 2 in passport photo | 600 × 600 px | Passport photo |
| Pixels for a 35 × 45 mm photo | 413 × 531 px | Passport photo |
| Pixel size that fits under 50 KB | ≈ 500 × 500 px JPG | Resize to KB |
| Instagram post | 1080 × 1080 · 1080 × 1350 px | Social media sizes |
| Story · Reel · TikTok | 1080 × 1920 px | Social media sizes |
| YouTube thumbnail | 1280 × 720 px | Social media sizes |
| 4 × 6 in print at 300 DPI | 1200 × 1800 px | Print sizes |
| A4 at 300 DPI | 2480 × 3508 px | Print sizes |
| Photo for an application form | ≈ 200 × 230 px · 20–50 KB | Photo & signature |
| Signature for an application form | ≈ 140 × 60 px · 10–20 KB | Photo & signature |
| Best JPG quality for the web | 75 – 85 | Compress image |
Know the size already?
Open the resizer, drop in the photo, type the numbers. Free, in your browser.