Free HEIC to WebP Converter — Smallest Web-Ready Files

How to convert HEIC to WebP

1. Drop your HEIC files from iPhone onto the converter above — or click to browse and select multiple files at once.
2. Click Convert on a single file, or Convert all to process the entire batch in one go.
3. Download each WebP individually, or click Download all to save everything as a single ZIP archive.
4. Tip: WebP at quality 0.92 produces files 25–34% smaller than JPG from the same source. For web use, WebP is the most efficient format available today.

Private conversion — HEIC files stay on your device

HEIC photos are converted to WebP entirely in your browser — no file leaves your device. On Safari, the system's native HEIC codec handles decoding. On Chrome and Firefox, a WebAssembly build of libheif loads on first use and runs locally thereafter. The resulting WebP blob is created by the Canvas API and downloaded directly to your device.

Converting product photos, location shots, or client work from iPhone HEIC to WebP for web use — without those files passing through any cloud service — is a genuine privacy benefit. Disconnect from the internet after the page loads and the converter continues to work.

// Stage 1: decode HEIC to raw pixels (Safari native or WASM)
// Stage 2: encode raw pixels to WebP via Canvas API

async function heicToWebp(file) {
  let bitmap
  try {
    bitmap = await createImageBitmap(file)  // Safari: native HEIC decode
  } catch {
    const { heicTo } = await import('heic-to')  // Chrome/Firefox: WASM
    // heicTo returns a WebP Blob directly — skip Canvas on this path
    return heicTo({ blob: file, type: 'image/webp', quality: 0.8 })
  }
  // Safari path: draw to canvas and encode as WebP
  const canvas = document.createElement('canvas')
  canvas.width = bitmap.width
  canvas.height = bitmap.height
  canvas.getContext('2d').drawImage(bitmap, 0, 0)
  bitmap.close()
  return new Promise(resolve =>
    canvas.toBlob(resolve, 'image/webp', 0.8)
  )
}

Why convert iPhone photos to WebP for the web

WebP is the most efficient widely-supported image format for web delivery. At quality 0.92, WebP produces files 25–34% smaller than JPG at equivalent perceptual quality — and WebP is now supported by 97%+ of browsers including Safari 14+. Google PageSpeed Insights and Lighthouse flag JPG and PNG images as optimization opportunities and recommend WebP explicitly.

iPhone photos arrive as HEIC, which is browser-incompatible. Converting directly to WebP (rather than through JPG as an intermediate) avoids a double lossy compression step: HEIC → JPG → WebP would apply lossy encoding twice. HEIC → WebP applies lossy encoding only once in the final step, resulting in better output quality at the same file size.

E-commerce developers, content publishers, and WordPress theme builders who receive product or lifestyle photos from photographers using iPhones can use this converter to go directly from HEIC to web-optimized WebP in a single step — no Photoshop, no command line, no cloud upload.

HEIC vs WebP — format comparison

When to convert HEIC to WebP vs JPG vs PNG

Choose WebP when:

• Publishing to a website — WebP loads 25–34% faster than JPG at the same quality; Lighthouse recommends it
• WordPress or Shopify — both platforms support WebP natively (WP 5.8+, Shopify all plans)
• Next.js / Nuxt / Astro — framework image components serve WebP automatically; supply WebP for best results
• CDN delivery — smaller WebP files mean lower bandwidth costs and faster global delivery
• Product or portfolio photography — high-quality iPhone shots compressed to WebP are indistinguishable from HEIC at 30–40% smaller size

Choose JPG instead when:

• Sending to Windows users — older Windows apps may not open WebP; JPG is universally understood
• Photo labs and printing — printing services accept JPG, rarely WebP
• Email clients — some email clients do not render WebP inline; JPG is safer

Choose PNG instead when:

• Editing in Photoshop or Affinity — use PNG as a lossless intermediate, then export for web
• Transparency is required — both WebP and PNG support alpha, but if target app does not support WebP, use PNG

HEIC to WebP — avoiding double compression

A common workflow mistake is converting HEIC → JPG first, then JPG → WebP. This applies lossy compression twice: once when creating the JPG (introducing DCT artifacts), and again when encoding WebP (compressing the already-degraded data). The result is visibly worse at the same file size.

Converting HEIC → WebP directly passes the HEIC pixel data (after lossless HEVC decoding) straight to the WebP encoder. Only one lossy step occurs — in the WebP encoder — which operates on the full-quality decoded pixels from the HEIC source. This produces cleaner output with less ringing and blocking at any given quality setting.

// ❌ Two-step conversion: double lossy compression
// HEIC → JPG → WebP
// Quality loss compounds at each lossy step

// ✓ One-step conversion: single lossy step
// HEIC (decoded losslessly to pixels) → WebP (encoded once)

// This converter uses the one-step approach:
// 1. Decode HEIC to raw RGBA pixel buffer (lossless decode)
// 2. Encode pixel buffer directly to WebP at quality 0.80

// Result: cleaner WebP at the same file size vs going through JPG