What is the maximum file size?

3 MB. This is set by the Vercel free tier request body limit. For larger images, use the API with a self-hosted instance — there is no size cap when self-hosted.

Does conversion affect image quality?

Lossless formats (PNG, TIFF) preserve every pixel exactly. Lossy formats (JPEG, WebP, AVIF) reduce file size by discarding perceptually insignificant detail. The quality slider controls this trade-off: 80 is a good default for web images, 90+ for print-quality exports, and 60–70 for thumbnails where small file size matters more than sharpness.

Is my image uploaded to a server?

The browser UI processes images entirely using the Canvas API — nothing is sent to any server. If you use the REST API endpoint (/api/image-resizer), your image is processed server-side using Sharp and is never stored or logged.

What is the maximum image size?

The browser UI has no explicit size limit — Canvas processes as large an image as your device memory allows (typically several megabytes or more). The API endpoint accepts base64-encoded images up to 3 MB, which is the Vercel free-tier request body limit.

Tool comparison

Image Converter vs Image Resizer & Cropper

Image Converter and Image Resizer & Cropper are both conversion tools. They serve related purposes but are optimised for different tasks — understanding the distinction helps you choose the right one for your workflow.

Bottom line

Image Converter changes file format (PNG → WebP); Image Resizer changes image dimensions. They are complementary: convert for format compatibility and file size, resize for display requirements. In a pipeline, resize first, then convert to the target format.

What each tool does

Image Converter

Image conversion is the process of re-encoding a digital image from one file format to another, changing the container, compression algorithm, and colour depth according to the target format's specification. Different image formats make different trade-offs: PNG uses lossless compression and supports full alpha transparency, making it ideal for screenshots, icons, and graphics with sharp edges. JPEG uses lossy compression optimised for photographs, achieving small file sizes at the cost of some detail. WebP is a modern format developed by Google that supports both lossless and lossy compression as well as alpha transparency — it is typically 25–35% smaller than JPEG or PNG at equivalent quality, and all modern browsers support it. AVIF (AV1 Image File Format) is the newest of the major formats, achieving roughly 50% smaller files than JPEG at equivalent visual quality at the cost of longer encoding times. TIFF is a lossless, uncompressed format used in print and photography workflows. GIF supports up to 256 colours and is primarily used for animations. This tool converts between PNG, JPEG, WebP, AVIF, TIFF, and GIF, and can rasterise SVG files to any of those formats. Conversion runs on the server using the Sharp library (libvips) — your image is sent over HTTPS and is not stored.

Open Image Converter →

Image Resizer & Cropper

Image Resizer & Cropper is a free browser-based tool for resizing images to exact pixel dimensions, cropping a region of interest, rotating by 90-degree increments, and flipping horizontally or vertically. It accepts PNG, JPEG, WebP, AVIF, and GIF input and outputs PNG, JPEG, or WebP. The browser UI uses the Canvas API for instant live preview — no image is sent to a server. The REST API (POST /api/image-resizer) processes images server-side using Sharp for use in scripts, CI pipelines, and AI agent workflows. Common use cases include resizing photos for social media, cropping product images for e-commerce, fixing portrait/landscape orientation issues, and generating thumbnails.

Open Image Resizer & Cropper →

Side-by-side comparison

Feature	Image Converter	Image Resizer & Cropper
Category	conversion	conversion
Primary purpose	Convert images between PNG, JPEG, WebP, AVIF, TIFF, GIF, and SVG formats	Resize, crop, rotate, and flip images online — free, runs in your browser, no upload required.
Inputs	image, from, to, quality	image, width, height, fit, cropX, cropY, cropWidth, cropHeight, rotate, flipHorizontal, flipVertical, format, quality
Outputs	image, format, width, height, size_bytes	image, format, width, height, originalWidth, originalHeight, sizeBytes

When to use each

Use Image Converter when…

How to convert PNG to WebP online

Reduce PNG file size by converting to WebP format for faster web page loading.

How to convert JPEG to AVIF online

Shrink photo file sizes dramatically by converting JPEG images to the AVIF format.

Use Image Resizer & Cropper when…

How to resize an image to exact pixel dimensions

Scale an image to a specific width and height for social media, email, or web use.

How to crop an image online for free

Remove unwanted areas from an image by cropping to a specific region or preset aspect ratio.

Frequently asked questions

What is the maximum file size?: 3 MB. This is set by the Vercel free tier request body limit. For larger images, use the API with a self-hosted instance — there is no size cap when self-hosted.
Does conversion affect image quality?: Lossless formats (PNG, TIFF) preserve every pixel exactly. Lossy formats (JPEG, WebP, AVIF) reduce file size by discarding perceptually insignificant detail. The quality slider controls this trade-off: 80 is a good default for web images, 90+ for print-quality exports, and 60–70 for thumbnails where small file size matters more than sharpness.
Is my image uploaded to a server?: The browser UI processes images entirely using the Canvas API — nothing is sent to any server. If you use the REST API endpoint (/api/image-resizer), your image is processed server-side using Sharp and is never stored or logged.
What is the maximum image size?: The browser UI has no explicit size limit — Canvas processes as large an image as your device memory allows (typically several megabytes or more). The API endpoint accepts base64-encoded images up to 3 MB, which is the Vercel free-tier request body limit.