Resize Images

Resize any image to the exact size you need

Every platform wants images at a different size. A passport photo must be 35×45 mm, a YouTube thumbnail 1280×720 pixels, a LinkedIn banner 1584×396, an Instagram portrait post 1080×1350, and an exam form might want 200×230 pixels under 50 KB. Fileopia's image resizer handles all of these from one screen: type the size in pixels, percent, centimetres, millimetres or inches, or pick a ready-made preset, and download a perfectly sized image in seconds.

It resizes one image or hundreds at once, keeps the aspect ratio unless you tell it otherwise, and can crop or pad to an exact shape so nothing gets stretched. Everything runs in your browser, so your photos are never uploaded.

Features

• Units: pixels, percent, cm, mm and inches with a DPI setting (300 DPI by default for print).
• Presets: passport 35×45 mm, Instagram square, portrait and story, YouTube thumbnail, LinkedIn banner, Facebook cover, X header, Full HD and A4 at 300 DPI.
• Exact shapes without distortion: fit inside, fill and crop to the exact size, pad with a background colour, or stretch if you really want to.
• Do not enlarge: leave images that are already smaller than the target untouched.
• Maximum file size: set a KB limit for JPG or WebP output and the resizer finds the best quality under it.
• High-quality downscaling: large reductions are done in several halving steps for sharp results without jagged edges.
• Batch: resize a whole folder in one go and download a ZIP.
• Format choice: keep the original or save as JPG, PNG, WebP or AVIF.

How to resize an image

• Drop one or more images (JPG, PNG, WebP, HEIC, GIF, BMP, TIFF, AVIF).
• Pick a preset, or choose a unit and type the width and/or height.
• If you set both width and height, choose how to handle a different shape: fit, fill & crop, pad or stretch.
• Optionally set an output format and a maximum file size in KB.
• Click Resize and download the image or the ZIP.

Pixels, centimetres and DPI explained

Digital images are measured in pixels. Physical sizes such as centimetres or inches only make sense together with a resolution, measured in dots (pixels) per inch. At 300 DPI – the usual standard for photo prints – one inch is 300 pixels and one centimetre is about 118 pixels. So a 35×45 mm passport photo at 300 DPI is 413×531 pixels, and a 4×6 inch print is 1200×1800 pixels.

When you choose cm, mm or inches, enter the DPI the printer or form expects; the resizer converts the size to pixels for you.

Fit, fill, pad or stretch?

Presets use fill & crop automatically so the output is always exactly the size the platform expects.

Common image sizes in 2026

Platforms change their recommendations from time to time; if an upload looks cropped, check the platform's help page and enter the size manually.

Resizing for online forms

Exam, recruitment and visa portals often specify both pixel dimensions and a maximum file size, for example '200×230 pixels, 20–50 KB, JPG'. Choose 'Custom', enter 200 and 230 pixels, select Fill & crop so the face is centred without distortion, set the format to JPG and type 50 in the 'Max file size' box. One click gives you a compliant file. For signatures, use the same approach with the signature dimensions and a 20 KB limit.

Will resizing reduce quality?

Making an image smaller always removes pixels, but done properly it looks sharp. The resizer reduces large images in several halving steps with high-quality smoothing, which avoids the jagged edges and moiré you get from a single big reduction. Making an image larger cannot add real detail; for enlargements of 2× or more, Upscale Image uses Lanczos resampling and sharpening for a better result.

Privacy

Every step happens inside your browser tab. The image is decoded, edited and re-encoded on your own device using the browser's built-in image engine and WebAssembly, and the result is handed straight to your downloads folder. Nothing is uploaded, nothing is stored on a server and there is no queue, so private photos, ID cards, screenshots with personal data and unreleased product shots never leave your computer or phone. You can even switch off Wi‑Fi once the page has loaded and the tool keeps working.

Related tools

• Compress Image – shrink file size to an exact KB target.
• Crop Image – choose exactly which part of the picture to keep.
• Passport Photo Maker – passport and visa photos with print sheets.
• Image Converter – change format without resizing.