ResizeboxQuick online image resizer and format converter for photos and graphics.

4.6 (5)

Reviewed by Daniel Nikulshyn·Updated July 2026

Image Editing Web App Photo Tools Format Conversion No-Code Free Tool Productivity

Overview

Resizebox is an online tool for quickly resizing and converting image formats. It is designed for users who need to adjust the size of photos and graphics. The tool allows users to change the dimensions and file type of their images. It is suitable for individuals who require a simple and efficient way to modify image sizes and formats without needing advanced editing skills. The exact capabilities, such as supported formats and any limitations on file size or quality, are not specified.

Key features

Image resizing by pixels or percentage
Format conversion between popular types
Drag-and-drop upload
Downloadable processed files
Works in any modern browser

Pricing

Model: Freemium
Category: Image Generation
Rating: 4.6 / 5 (5)

Use cases

Resize Photos for Social Media

Quickly scale images to fit platform-specific dimensions for Instagram, Twitter, or Facebook posts without opening a desktop photo editor.

Convert Image Formats for Web Use

Transform images between popular formats like JPG, PNG, or WebP to optimize them for faster website loading and browser compatibility.

Shrink Attachments for Email

Reduce image dimensions or file size so photos and graphics meet email attachment limits and send reliably.

Prepare Graphics for Print

Adjust image dimensions by pixels or percentage to match print requirements before sending files to a printer or client.

Pros & Cons

Pros

Simple, no-install browser workflow
Supports common image formats
Fast processing for routine resizing tasks
Free to use for basic needs

Cons

Limited advanced editing features
Depends on internet connection
Large batch jobs may be slow
Output quality varies by source image

Reviews

4.6

Average from 5 ratings.

Tomáš Novák

Feb 20, 2026

Years in this space

I've evaluated a lot of these over the years. What stands out here is works in any modern browser — handled better than most — and supports common image formats. Output quality varies by source image is my one real gripe. Worth the time if this is your use case.

Naomi Suzuki

Feb 5, 2026

Years in this space

I've evaluated a lot of these over the years. What stands out here is format conversion between popular types — handled better than most — and supports common image formats. Worth the time if this is your use case.

Fatima Zahra

Feb 1, 2026

Solid for our team

We rolled this out across the team last quarter and simple, no-install browser workflow. Drag-and-drop upload fits neatly into how we already work, and downloadable processed files removed a step we used to do by hand. Output quality varies by source image, which is the main caveat, but it has held up under daily use.

Linda Petersen

Jan 16, 2026

Does the job

Pretty happy overall. Drag-and-drop upload just works and supports common image formats. but no dealbreakers — I'd recommend it to a friend without hesitating.

Gunnar Eriksson

Oct 2, 2025

Solid for our team

We rolled this out across the team last quarter and simple, no-install browser workflow. Format conversion between popular types fits neatly into how we already work, and downloadable processed files removed a step we used to do by hand. Output quality varies by source image, which is the main caveat, but it has held up under daily use.

Q&A

What happens to image quality after resizing or format conversion?

Output quality can vary depending on the original image and the chosen conversion settings; since Resizebox is designed for quick, basic edits, it may not preserve all high‑resolution details.

Asked by Kwabena Asante · Mar 31, 2026

Can I resize multiple images at once with Resizebox?

Resizebox offers a drag-and-drop interface for individual files; it does not provide a built‑in bulk batch mode, so large sets of images may need to be processed one by one, which can be time‑consuming.

Asked by Hasan Demir · Mar 18, 2026

Is there a file size limit for images uploaded to Resizebox?

The tool does not specify an explicit file size limit, but very large files may experience slower processing or timeouts due to browser and internet constraints.

Asked by Malik Rasheed · Mar 13, 2026

What file formats does Resizebox support for conversion?

Resizebox handles popular image formats such as JPEG, PNG, GIF, and BMP, allowing users to easily switch between these types while resizing.

Asked by Sanjay Gupta · Feb 14, 2026