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Image Compressor

Reduce image file size dramatically while keeping visual quality.

Drag & drop files here

or use the button below · processed locally on your device

Output settings

Free file tool

Free Image Compressor online

Reduce image file size dramatically while keeping visual quality. Use the tool directly in your browser with no sign-up. It supports multiple source files in the same session, so it also works as a free batch tool when you have more than one file.

Free to use

No payment required for this tool.

Batch conversion

Queue multiple source files in one session.

Browser-based

The conversion workflow runs from the web page on your device.

No sign-up

Start the file workflow without creating an account.

What Image Compressor is useful for

  • Reducing upload size
  • Preparing images for email or web forms
  • Balancing visual quality against file size

Input and output checks

Accepted input: Text or settings entered on the page.

  • Open the downloaded output before deleting or replacing the source file.
  • Check the details that matter for your use: page count, dimensions, orientation, text, duration or metadata.
  • For batch jobs, confirm every queued file produced the expected output.
  • If quality or size matters, compare more than one settings combination before choosing the final copy.

How to use this calculator: Image Compressor

  1. 1Drag & drop your file onto the upload zone, or tap Browse Files.
  2. 2Review the detected file information — size, type, resolution or page count.
  3. 3Tune the output settings to match what you need.
  4. 4Press Convert and watch the progress bar; processing happens locally in your browser.
  5. 5Download individual results, or use Download All to get a ZIP of everything.

Worked conversion example

Example: upload a 12 MB source file, choose a moderate quality setting, and run the tool. Exact output size depends on image detail, fonts, pages, duration and codec efficiency; compare the downloaded result visually before replacing the original.

Accepted input
Text or settings entered on the page
Batch behaviour
Multiple files supported

Output settings

SettingExample/defaultEffect
Quality70Changes how the output is encoded or arranged; preview the result before relying on it.
Max width (px, 0 = keep)0Changes how the output is encoded or arranged; preview the result before relying on it.
Output formatJPEGChanges how the output is encoded or arranged; preview the result before relying on it.

How the browser process works

Reduce image file size dramatically while keeping visual quality. The page sends the selected file and settings to its image-compress browser engine, creates a new output and downloads it without overwriting the source.

Privacy, quality checks and limitations

  • Keep the original file until the downloaded output has been opened and checked.
  • Verify page count, orientation, dimensions, text legibility, audio/video duration and metadata relevant to your use.
  • Browser-local processing reduces routine upload exposure, but your device, browser extensions and download location still matter.
  • A converted preview is not proof of legal authenticity, archival compliance, accessibility or digital-signature validity.

Frequently asked questions

Is Image Compressor free to use?

Yes. You can use Image Compressor on OneCalcApp without paying or creating an account.

Does Image Compressor support batch files?

Yes. This tool accepts multiple source files in the same session so you can process a batch without reopening the page for every file.

Do I need to sign in?

No. The conversion workflow can be used without signing in.

What should I check after conversion?

Open the downloaded output and compare the page count, dimensions, orientation, text readability, duration or other details that matter for your file type before replacing the original.

Does the tool overwrite my original file?

No. The tool creates a new output for download, so keep your original source until you have checked the converted result.

Related converters

🖼️ PDF to JPG🖼️ PDF to PNG📕 JPG to PDF📕 PNG to PDF🎨 JPG to PNG🎨 PNG to JPG🌐 WEBP to JPG🌐 JPG to WEBP

Related Guides & Articles

Step-by-step guides for this conversion and related file formats.

PDF to JPG: Complete Guide to Converting PDF Pages into Images

Learn how to convert PDF pages to JPG images, understand image quality and resolution, reduce file size, and choose the right format for documents, websites and online uploads.

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PDF to PNG: Complete Guide to Converting PDF Pages into High-Quality PNG Images

Learn how PDF to PNG conversion works, when PNG is better than JPG, how resolution affects image quality, and how to convert PDF pages into high-quality PNG images.

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Client-Side File Conversion with WebAssembly

How modern browsers can convert images, PDFs, audio and video without ever uploading your files to a server.

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