Free Image Optimizer Online

What is an image optimizer?

An image optimizer is a free online tool that compresses JPEG and PNG images to reduce file size while maintaining visual quality. This tool runs entirely in your browser; your images are never uploaded to any server.

What image formats does this tool support?

The tool supports JPEG and PNG formats. You can also convert PNG images to JPEG using the built-in PNG → JPEG toggle if you need smaller file sizes for photos.

How much can this tool reduce my image file size?

Depending on the image, file sizes can be reduced by up to 98–99%. For example, a 4.46 MB PNG can be compressed down to under 60 KB. Results vary based on the original image content and your quality settings.

What does the “Auto” mode do?

For JPEG, Auto mode finds the best quality setting within your compression limit so you get the smallest file without visible quality loss. For PNG, it automatically picks the best palette or RGB format for each image.

Can I optimize multiple images at once?

Yes. Upload multiple JPEG and PNG files at once. The tool processes each file individually and shows detailed results, including dimensions, color count, processing time, original file size, compressed file size, and percentage reduction. You can download images individually or all at once as a ZIP.

Can I resize images while optimizing?

Yes. Toggle the Resize option and set a maximum width and height. Images larger than your specified dimensions will be scaled down proportionally. Smaller images are left unchanged.

What does “Strip EXIF” mean?

EXIF data is metadata embedded in images by cameras and phones. It can include location, camera model, date, and other information. Stripping it reduces file size and removes potentially sensitive data like GPS coordinates.

Will optimizing reduce the visible quality of my images?

At default settings, the quality difference is barely noticeable. You can adjust the quality and effort sliders to find the right balance. Lower quality values mean smaller files with more compression, while higher values preserve more detail.

Are my images safe when using this tool?

Yes. Your images are processed entirely in your browser using WebAssembly. They are never uploaded to any server — nothing is stored or shared.

I extracted images from a PDF, and they’re too large. Can I optimize them here?

Yes. Use our free Extract Images from PDF tool to pull out the images, then drop them into this optimizer to reduce their file size.

Can I convert my optimized images to PDF?

Yes. After optimizing, use our free PNG to PDF or JPEG to PDF tools to convert your images into PDF documents.

What is APITemplate.io?

APITemplate.io is designed for generating PDF documents from reusable templates. It can be easily integrated with popular tools like Zapier, Airtable, Make.com, Bubble.io, n8n, UiPath, or directly via REST API, making it highly adaptable to various workflows.

There are three main ways to generate PDF documents using APITemplate.io:

1. Template-based PDF generation: Create PDFs from predefined templates.
2. HTML to PDF generation: Convert HTML content directly into PDF format.
3. URL to PDF generation: Convert entire web pages to PDFs by simply providing their URLs.

The platform also supports custom CSS and JavaScript, allowing for advanced styling and customization. Its powerful template engine helps you create complex documents efficiently, while the API Console lets you preview and customize JSON data instantly.

In addition, APITemplate.io supports custom headers and footers, including page numbers and total page counts, making it an excellent choice for creating polished, professional PDF documents.