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Compress WebP Online

Reduce WebP file size up to 70% — quality control, batch resize, convert WebP to JPEG or PNG — 100% private, zero upload, instant download.

100% private — images processed locally in your browser, never uploaded. Loading…
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Global Settings
Balanced
Low (high quality)High (small file)
Good balance — recommended for photos
Max Width (px)
Max Height (px)
Aspect ratio always preserved. 0 = keep original dimension.

About Compress WebP Online

Compress WebP images in your browser — no upload, no server, complete privacy. Compress WebP Online uses the browser's built-in WebP encoder to reduce WebP file sizes with precise quality control, and also supports converting WebP to JPEG or PNG for maximum compatibility.

Drop any WebP files — product images, web graphics, animated frames — and the tool compresses them using your chosen compress level. The before/after split viewer shows the quality difference at a glance. Resize by max width/height to target specific display sizes, and strip metadata for extra savings and privacy.

Everything runs entirely locally in your browser after the initial load. No account required, no file size limits, and no per-image fees. Batch compress hundreds of WebP files and download the entire set as a ZIP archive in seconds.

Features

  • 100% browser-local — browser WebP codec, no upload, works offline, your files never leave your device
  • Batch WebP compress — process hundreds of files simultaneously with real-time progress and savings per file
  • WebP → JPEG/PNG conversion — export WebP as JPEG (universal) or PNG (lossless, preserves transparency)
  • Precise compress level — 1–100 slider with live badge and quality hint; before/after preview for confirmation
  • Smart resize — Max Width/Height with aspect-ratio lock; often the most impactful way to reduce WebP size
  • Strip Metadata — removes EXIF, XMP, and ICC profiles for privacy and additional size savings
  • Before/After split viewer — drag divider and zoom slider for pixel-level quality comparison
  • Batch ZIP download — download all compressed files in one archive or save individually
  • No gain protection — if compressed output is larger than original, the original is automatically kept

How to Use

  1. Drop WebP files. Drag WebP files onto the drop zone, or click Browse. Any number of files is accepted.
  2. Choose output format. WebP → WebP for best compression. WebP → JPEG for universal compatibility. WebP → PNG for lossless output with transparency.
  3. Set compress level. For WebP-to-WebP: level 15–35 is excellent for most web content. For WebP-to-JPEG: level 15–25 balances quality and size.
  4. Optional: resize. Enter Max Width and/or Max Height. This is the single most impactful change for reducing output file size.
  5. Compress and inspect. Click Compress All, then click any file to open the before/after split viewer. Drag the divider to compare quality.
  6. Download. Use the download icon per file, or Download ZIP for the complete batch.

Examples

Example 1 — Optimize website images: 30 WebP product images (avg 320 KB) → compress level 30, max width 1000 → avg 95 KB → 70% savings → download ZIP for deployment.

Example 2 — Convert for legacy compatibility: WebP gallery images → JPEG output, compress level 20 → JPEG versions for email clients and legacy browsers that don't support WebP.

Example 3 — Social media images: WebP images → max width 1200, compress level 45 → under 100 KB each → fast loading on mobile feeds.

Benefits

  • Format flexibility — compress WebP or convert to JPEG/PNG without quality loss beyond what you set — no forced format decisions.
  • Zero cost, zero limits — no account, no per-image pricing, no file size or count restrictions.
  • Instant privacy — WebP files never leave your browser; ideal for confidential product images or proprietary designs.

Frequently Asked Questions

What is WebP and why is it smaller than JPEG/PNG?
WebP is a modern image format developed by Google in 2010, designed to replace both JPEG (for photos) and PNG (for graphics). WebP uses a more advanced compression algorithm — predictive coding + DCT — that achieves 25–35% smaller files than JPEG at the same visual quality, and 25–50% smaller than PNG. It also supports animation (like GIF) and lossless mode (like PNG).
Can I convert WebP back to JPEG or PNG?
Yes — select JPEG or PNG as the output format. JPEG output works for all WebP images (including transparent ones, which get a white background). PNG output preserves transparency if present in the WebP file. Note that converting WebP → JPEG → WebP will lose quality each generation, so convert only when necessary.
Does WebP support transparency?
Yes — both lossless and lossy WebP support alpha transparency. When compressing a WebP with transparency to another WebP, transparency is preserved. If you convert to JPEG, transparent areas are composited onto a white background (JPEG has no transparency support). Choosing PNG output preserves transparency.
What compress level should I use for WebP?
WebP quality is already very high. For most web images, compress level 15–35 gives excellent quality (visually lossless for photos). Level 40–55 works well for social media and thumbnails. Level 60–80 aggressively reduces size for mobile-first sites where bandwidth is critical. Check the before/after preview at your target level.
Is WebP supported in all browsers?
WebP is supported in Chrome, Firefox, Safari 14+ (macOS Big Sur / iOS 14), Edge, Opera, and Samsung Internet — covering over 97% of global browser market share as of 2024. The only significant exception is very old browsers. For maximum compatibility, you can also export as JPEG fallback using this tool.
Can I batch compress WebP files?
Yes — drop any number of WebP files and they'll all compress with your global settings. Real-time per-file progress shows original size, compressed size, and percentage saved. Download as a ZIP once done. There is no limit on the number of files or total batch size other than your available browser memory.
What is the difference between lossy and lossless WebP?
Lossy WebP discards some pixel data (like JPEG) to achieve 25–35% smaller files than JPEG. Lossless WebP is like PNG — exact pixel reproduction, but typically smaller than PNG due to a better compression algorithm. This tool uses lossy WebP output for the compress action. For near-lossless, use compress level 1–5.
How does resizing help WebP compression?
Resizing is complementary to format compression. A WebP image displayed at 600px wide only needs to be 600px wide — keeping it at 3000px serves unnecessary data. Setting Max Width + WebP output often reduces a 3 MB WebP to under 100 KB. The aspect ratio is always preserved automatically.

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