You can upload a maximum of 10 images at a timeDrag & Drop your images here orSupported formats: WEBP
90%
Resize
Convert WEBP to WEBP Online Free — Fast Batch Conversion
How to Convert Images Online
1Upload your WebP files
Drag and drop up to 10 .webp files, or click Choose File. Maximum 20 MB per file.
2Set target quality
Move the slider to your target. 80% is recommended for web — balances file size and visual fidelity.
3Click Compress
Convertify recompresses each file server-side using Rust + libvips.
4Download and deploy
Download optimized .webp files. Replace originals on your site and measure the LCP improvement in Lighthouse.
Supported Image Formats
WebP
Modern image format by Google. Up to 30% smaller than JPG with the same quality.
HEIC
Apple photo format used by iPhone and iPad. High quality with small file size.
HEIF
High Efficiency Image Format — same as HEIC, used on Apple devices.
PNG
Lossless format that preserves every pixel. Best for screenshots and logos.
JPG
Universal format for photos. Supported everywhere, great balance between quality and file size.
GIF
Classic format for simple animations. Supports transparency and up to 256 colors.
BMP
Uncompressed bitmap format. Maximum quality but very large file size.
TIFF
Professional lossless format used in printing and photography.
AVIF
Next-gen format with excellent compression. Up to 50% smaller than JPG.
PPM
Portable Pixmap format used in Unix/Linux environments.
HDR
High Dynamic Range format storing extended brightness data.
FITS
Flexible Image Transport System used in astronomy and science.
PDF
Portable Document Format. Convert PDF pages to JPG, PNG or WebP images.
AVIF vs WebP vs HEIC vs JPG
Quick comparison to help you choose the right format
AVIF
- Size: Up to 50% smaller than JPG
- Browsers: Chrome, Firefox, Safari
- Transparency: ✓
- Best for: Web performance
WebP
- Size: 25-35% smaller than JPG
- Browsers: All modern browsers
- Transparency: ✓
- Best for: Web compatibility
HEIC
- Size: ~50% smaller than JPG
- Browsers: Safari only
- Transparency: ✓
- Best for: iPhone storage
JPG
- Size: Baseline
- Browsers: All browsers & apps
- Transparency: ✗
- Best for: Universal sharing
Frequently Asked Questions
- How much can I compress a WebP file?
- Typically 30–70% smaller. Files exported at Q90+ compress 45–50% when recompressed to Q80. Median reduction on Convertify is 47%.
- Is WebP compression lossy?
- Yes, by default. WebP lossy compression removes imperceptible visual data. At quality 80%, the result is virtually indistinguishable from the original in normal viewing conditions.
- What quality should I use for website images?
- Many professional image pipelines target 75–85% for web delivery. Quality 80% balances file size and visual fidelity on all screen sizes.
- Will compressing remove transparency?
- No. The alpha channel is fully preserved. Transparent backgrounds and overlay effects remain intact.
- Does this improve Core Web Vitals?
- Yes. Smaller images directly reduce LCP. Compressing a 500 KB image to 150 KB can improve LCP by 500ms+ on mobile connections.
- Can I compress multiple WebP files at once?
- Yes. Upload up to 10 .webp files at once. Each file processes and downloads individually.
- WebP or AVIF — which is better?
- WebP has broader browser support and faster encoding. AVIF is ~20% more efficient but encodes slower and has less CMS support. Use WebP for compatibility.
- Is it safe?
- Yes. HTTPS encryption, in-memory processing, immediate deletion after download.
Why recompress WebP files?
WebP already beats JPG by 25–35% at equivalent visual quality. So why compress further?
Because most tools over-encode. Figma exports WebP at quality 90%. WordPress generates WebP at 82–90%. Shopify defaults to 85–90%. These settings prioritize safety over performance.
Recompressing from Q92 to Q80 cuts file size by another 40–50% with no perceptible visual change at 1920×1080. For a page with 15 product images, that is the difference between 4.5 MB and 2 MB total page weight — directly measurable in Lighthouse.
Core Web Vitals impact
LCP (Largest Contentful Paint) determines when your largest visible element renders. Image weight is the single biggest factor.
A 500 KB hero image on a 5 Mbps mobile connection adds ~800ms to LCP. Compressing to 150 KB saves over 500ms — often enough to move your Lighthouse LCP from orange to green.
Real example: 1600×900 e-commerce banner at Q92 = 480 KB. At Q78 = 165 KB. Same visual appearance, 315 KB saved, measurable improvement in PageSpeed Insights.
This is the highest-impact, lowest-effort performance optimization for most websites. Drop a hero image above and measure the savings.
Real compression results
480 KB e-commerce banner (1600×900, Q92) → 165 KB at Q78 — 66% smaller.
220 KB product photo (1000×1000, Q90) → 125 KB at Q80 — 43% smaller.
95 KB blog thumbnail (800×450, Q88) → 48 KB at Q75 — 49% smaller.
340 KB email newsletter hero (1200×600, Q95) → 130 KB at Q80 — 62% smaller.
Across WebP files processed on Convertify, the median reduction at Q80 is 47%.
WebP vs AVIF — which to choose
AVIF is roughly 20% more efficient than WebP at equivalent quality. But it has tradeoffs:
Encoding is 5–10x slower. For batch workflows, processing time matters.
Older Safari and iOS versions do not display AVIF. WebP has broader reach.
Some CMS platforms do not support AVIF upload or delivery.
For maximum compatibility and fast processing, compress WebP. For cutting-edge performance where you control the delivery stack, convert to AVIF.
If you still serve JPG on the web, the first step is converting to WebP, then optimizing quality.
Transparency and alpha channels
WebP supports alpha channels — just like PNG. Compressing a WebP with transparency fully preserves the alpha data. Transparent backgrounds, drop shadows, and overlay effects remain intact.
If you currently serve transparent PNGs, consider converting to WebP first, then compressing. Combined savings reach 60–80% compared to the original PNG.
Privacy and file handling
Files upload over encrypted HTTPS. Processing happens in memory — no disk storage, no content logging. Files delete immediately after download.
No account. No watermarks. No daily limits — batch up to 10 files at once. Your website images never leave the processing pipeline.