Image Compressor

Compress, resize, watermark & convert images in bulk

SEO & ContentFREEYour data never leaves your browser

100% freeNo signupRuns in your browser

Image Compressor is a free, browser-based tool that lets you compress, resize, watermark & convert images in bulk — with zero signup, zero installation. Your data never leaves your browser. Part of 116+ free developer and business tools at wowhow.cloud, built and maintained by a team with 14+ years of hands-on development experience.

TOOLImage Compressor

Drag & drop images here, or click to browse

PNG, JPG, WebP — up to 100 images at once

About Image Compressor

Unoptimized images are the leading cause of failed Core Web Vitals scores — specifically Largest Contentful Paint (LCP), which Google measures as a direct ranking factor. Beyond SEO, oversized images consume mobile data, slow down e-commerce pages, and inflate hosting bandwidth costs. A full image optimization workflow involves compression, format conversion, dimension resizing, metadata stripping, and watermarking — this tool handles all five steps in a single browser session without sending images to any server.

How It Works

All processing runs inside your browser using the HTML5 Canvas API. When you drop images into the tool, they are decoded into raw pixel data in memory. The Canvas API then re-encodes them at your chosen quality level and target format. JPEG quality is controlled on a 0-100 scale where 75-85 typically gives the best size-to-quality ratio. WebP at quality 80 commonly beats JPEG at quality 85 in file size while looking identical to the human eye.

Resize presets map to exact pixel dimensions used by each social platform — Instagram feed posts (1080×1080), YouTube thumbnails (1280×720), Facebook cover photos (820×312), LinkedIn posts (1200×627), and others. The tool maintains aspect ratio by default or allows free-form cropping. EXIF stripping reads the binary JPEG header and removes all metadata segments (APP1 through APP15) before re-encoding, which also removes GPS coordinates and device fingerprinting data.

Watermarking positions your text overlay at eight anchor points (corners and edges) with adjustable opacity. The final files are assembled into a ZIP archive using a browser-native compression library so no upload or server round-trip is needed at any stage.

Who Is This For

A photographer stripping GPS EXIF data from 50 client delivery photos before sharing download links publicly on a portfolio site.

An e-commerce manager batch-converting 80 product PNG images to WebP to reduce page weight and improve LCP scores ahead of a Google Core Update.

A social media manager resizing a single brand shoot to six platform-specific dimensions using presets — Instagram, LinkedIn, YouTube, and Facebook — in under two minutes.

A freelance developer compressing all hero images for a client site from an average of 1.8MB to under 200KB to pass a Google PageSpeed audit before launch.

A content creator adding a semi-transparent watermark to 30 tutorial screenshots before publishing them in a blog post to protect original work.

Scope note: Compression quality is measured perceptually but browser Canvas encoding does not offer the same level of optimization as server-side tools like libvips, ImageMagick, or Squoosh's advanced codecs. Very high-resolution images (above 20 megapixels) may hit browser memory limits on devices with less than 4GB RAM. AVIF format is not currently supported — WebP is the recommended modern alternative.

How to Use

Drag and drop up to 100 images (PNG, JPG, WebP) or click to browse

Use the Compress tab to set quality, format, and EXIF stripping options

Use Resize Presets for social media sizes (Instagram, YouTube, etc.)

Add watermark text with custom position and opacity in the Watermark tab

Click Compress — then download individually or all at once as a ZIP

Use the compare button on any image to see before/after side by side

Frequently Asked Questions

No. All compression, resizing, watermarking, and EXIF stripping happens 100% in your browser using the Canvas API. Your images never leave your device.

Input: PNG, JPG/JPEG, WebP. Output: same as input, or convert between any of these formats. WebP typically offers the best compression ratio.

Typically 60-90% size reduction depending on the image and quality setting. A 2MB photo can often be reduced to 200-400KB with minimal visible quality loss.

Yes! Use the Resize Presets tab to quickly resize to Instagram Post (1080x1080), YouTube Thumbnail (1280x720), Facebook Cover, Twitter/X, LinkedIn, Pinterest, and more.

Yes. Enable "Strip EXIF metadata" in the Compress tab. You can also view EXIF data (camera, GPS, date) for any JPEG before removing it.

Up to 100 images in a single batch. Processing is local, so speed depends on your device. A progress bar shows real-time status.

Page load speed is a confirmed Google ranking factor. Large images are the single biggest cause of slow Core Web Vitals scores, particularly Largest Contentful Paint (LCP). Google's own PageSpeed guidelines recommend images under 100KB for hero sections and under 50KB for thumbnails. Reducing image weight directly improves LCP, which feeds into Google's overall page experience score.

WebP is an image format developed by Google that typically produces files 25-35% smaller than equivalent JPEG files at the same visual quality. All modern browsers support WebP. For web use, WebP is almost always preferable to JPEG or PNG. The exception is when you need broad compatibility with very old email clients or legacy CMS platforms that cannot handle WebP.

EXIF metadata embedded in JPEG photos can include GPS coordinates (exact location where the photo was taken), camera make and model, shooting date and time, and sometimes device serial numbers. Photos taken on smartphones almost always contain GPS data unless location access was denied. Stripping EXIF before publishing protects user privacy and reduces file size by a small amount.