Compress JPEG

Reduce JPEG file size in your browser by re-encoding photos with a practical quality setting.

Click or drag JPEG files here to upload

Up to 20 images · Max 10MB each
0 files

What does Compress JPEG do?

Compress JPEG reduces JPEG file size by re-encoding with adjustable quality.

  • Primary use: Compress JPEG reduces JPEG file size by re-encoding with adjustable quality.
  • Key technical fact: JPEG compression is lossy, so lower quality usually means smaller files but more visible artifacts.
  • Practical check: Compare visual quality, pixel dimensions, metadata, and exported file size before publishing the processed image.
Topic Direct answer Source
Direct answer Compress JPEG reduces JPEG file size by re-encoding with adjustable quality. JPEG standard family
Key fact JPEG compression is lossy, so lower quality usually means smaller files but more visible artifacts. JPEG standard family
Processing model Runs locally in the browser; no production Node server receives the input. Browser JavaScript

Shrink JPEG photos with quality control

Compress JPEG re-encodes JPEG images locally with a lower quality setting to reduce file size. It is best for photos, banners, and screenshots without transparency where smaller downloads matter.

JPEG compression is lossy: lower quality usually means smaller files, but it can add blocking, blur, color shifts, or ringing around edges. Avoid repeated JPEG recompression when possible, and compare the output at the size it will be viewed.

How to use

  1. Drag and drop JPEG files onto the upload area, or click to select files.
  2. Each file is compressed automatically and the compression rate is displayed.
  3. Download individual compressed files or use Download All to get a ZIP archive.

When should you compress JPEG?

JPEG is a lossy photo format designed for continuous-tone images, not transparent graphics or sharp UI icons.

Use this tool when you need quick browser-local JPEG optimization for web pages, email attachments, or CMS uploads. If a source image has transparency, choose PNG or WebP instead because JPEG fills transparent pixels.

Compress with Python

A server-side or build-step equivalent can re-save a JPEG with a chosen quality level:

from PIL import Image

original = Image.open('input.jpg')
original.save('compressed.jpg', optimize=True, quality=80)

MCP integration

MCP (Model Context Protocol) lets AI agents and apps discover and run Coding.Tools utilities for repeatable conversions, formatting, hashing, and generation workflows.

MCP tool name: compress-jpeg

MCP endpoint: https://coding.tools/mcp

Call tools/list first. Each tool entry includes inputSchema, outputSchema, and examples so an AI agent or client can build valid arguments without guessing.

For tools/call, read result.content[0].text for the display value and result.structuredContent for machine parsing. Tool-level failures return isError: true; protocol failures return a JSON-RPC error.

Example tools/call request:

curl -s https://coding.tools/mcp \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "MCP-Protocol-Version: 2025-06-18" \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/call","params":{"name":"compress-jpeg","arguments":{}}}'

This image tool is browser-only in MCP. tools/call returns isError: true plus a resource_link to the web UI instead of processing local image bytes on the server.

Most text and data tools accept an input string plus optional options. Browser-only image tools are listed for discovery and return a web UI link when they need browser image APIs.