6 Free Image Resizers That Work Offline in Your Browser

Resizing a photo for an SSC form or a passport print should not mean uploading your face to a server you don't control. The six tools below change image dimensions right on your phone or laptop. They work offline after the page loads or as a desktop app, and none of them need a sign‑up or leave a watermark.

1. Toolzo Image Resizer (browser, client‑side)

Best for: Indian form uploads where you need exact pixels, centimetres, or percentage scaling in one tool.

Toolzo's image resizer loads inside your browser and runs offline after the page opens. It offers three resize modes: pixels (for SSC, IBPS, and other online forms), centimetres (for print and passport specs), and percentage (for quick shrinking). You can lock or unlock the aspect ratio. The tool reads JPG, PNG, and WebP files and outputs in the same format. No watermark, no daily limit, and your photo never leaves your device.

Limitation: The centimetre mode uses a standard 96 DPI conversion, so for professional print work that demands 300 DPI, you may need a desktop tool. It also does not have a built‑in crop function; you need to crop to the desired shape before resizing if the original photo is the wrong aspect ratio.

2. Squoosh (browser PWA, offline after first visit)

Best for: Seeing exactly what the resize and compression do before you save.

Squoosh is Google's open‑source image tool. It runs as a Progressive Web App and works fully offline after the first visit. You can resize by exact pixels or percentage, and the side‑by‑side preview shows the output in real time. A quality slider lets you compress after resizing. The tool supports JPG, PNG, WebP, AVIF, and more.

Limitation: No centimetre mode. No aspect‑ratio lock indicator; you must calculate proportions manually if you want to keep them. The interface is technical and not optimised for quick form‑photo resizes.

3. Windows Paint / Mac Preview (built‑in, offline, no extra tool)

Best for: A fast single resize on a laptop when you already know the pixel numbers.

On Windows, open the photo in Paint, click Resize, choose "Pixels," enter the dimensions, and save. On a Mac, open the image in Preview, go to Tools > Adjust Size, enter the pixel values, and export. Both are offline, free, and already installed.

Limitation: Neither tool offers centimetre input or percentage mode with a live preview. You cannot see the file size before saving. And Paint does not lock the aspect ratio well if you uncheck the "Maintain aspect ratio" box.

4. Caesium (desktop, batch, fully offline)

Best for: Resizing dozens of images at once on a laptop without any upload.

Caesium is a free, open‑source desktop app for Windows and Linux. It resizes by pixels or percentage in batch mode. You can set a maximum width or height and it scales all images proportionally. It also compresses, so you can reduce KB at the same time. Fully offline.

Limitation: No centimetre mode, no crop tool. The app requires installation and is not available on mobile. The interface is functional but looks a bit dated.

5. GIMP (desktop, full editor, offline)

Best for: When you need precise control over every resize parameter, including DPI for print.

GIMP is a free, open‑source image editor. The Image > Scale Image dialog lets you resize by pixels, centimetres, inches, or percentage, with full DPI control. You can set the print resolution to 300 DPI for professional output. It runs offline on Windows, Mac, and Linux.

Limitation: It is a full‑featured photo editor with a learning curve. For a simple SSC form resize, opening GIMP is like using a chainsaw to slice bread. It's capable, but the simpler tools above are faster for one‑off resizes.

6. iLoveIMG Resize (online, but trusted by many)

Best for: Users who want batch resizing with a clean interface and are comfortable with the upload step.

iLoveIMG's resize tool supports pixels and percentage, has a batch mode, and the interface is polished. If you are already in the iLovePDF ecosystem, it integrates well. The privacy policy states that files are deleted after processing.

Limitation: It uploads files to a server, so it does not meet the offline/no‑upload requirement. The free tier has an hourly task cap. If you are resizing sensitive personal photos, a local tool is a safer choice.

Which one to pick for Indian form uploads

If you are on a phone and need a passport photo resized to 200 x 230 pixels for an SSC or IBPS form, Toolzo's image resizer is built for that. It gives you pixels, centimetres, and percentage in one place, and the file never leaves your phone. If you want to see the output quality before you download, Squoosh is unmatched. For batch resizing on a laptop, Caesium is the most efficient offline option. And if you are already on a laptop with no internet, Paint or Preview will get the job done with zero extra tools.