Use cases
What you want to accomplish — websites, email, WhatsApp, and social — with format and conversion steps. Not broad social-media advice. Files stay on your device.
Looking for “best format for…” comparisons?
Intent guides for websites, photos, logos, podcasts, and more — with converter links.
Browse best format guides →Websites
Convert masters to WebP or AVIF for delivery, keep JPG/PNG fallbacks when needed, and use SVG for logos. Resize to real display pixels before you convert.
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Cut pixels first with a resizer, then compress or convert to WebP/AVIF. Oversized dimensions waste more bytes than quality alone.
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WebP usually wins on size at similar quality for photos. JPG wins on universal compatibility. Many sites ship WebP with a JPG fallback.
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AVIF often compresses photos further than WebP. WebP has slightly broader tooling familiarity. Both need JPG/PNG fallbacks for older clients.
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SVG is usually best for website logos. Use PNG when you need a raster with transparency. Avoid JPG for logos — it softens edges and cannot store alpha.
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MP4 (H.264/AAC) is the safest website video format. WebM is a strong modern alternative. Convert MOV/MKV camera exports to MP4 before embedding.
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PDF for documents, JPG/PNG for photos, MP4 for short clips, ZIP only when bundling. Avoid niche containers (HEIC, MOV, 7Z) unless you know the recipient can open them.
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Compress images and PDFs, convert video to a smaller MP4, and only then ZIP. Removing unused pages and resizing photos often beats aggressive quality destruction.
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JPG is the safest photo format for email. PNG is better for screenshots, UI, and logos with transparency. Convert HEIC/WebP when recipients use older clients.
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Use a local PDF compressor with a quality slider for image-heavy scans. Remove extra pages first. Keep the original if you still need selectable text.
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MP4 is the best video format for WhatsApp for most people. Convert Apple MOV and desktop MKV exports to MP4, then compress if the chat still struggles.
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Convert to MP4 if needed, then re-encode with the Video Compressor. Lower quality/bitrate and trim length before destroying resolution.
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Convert MOV → MP4 in your browser, optionally compress, then share. MP4 plays more reliably across Android and iPhone WhatsApp chats.
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Social
MP4 is the practical best video format for Instagram uploads. Convert MOV/MKV sources to MP4 and compress oversized exports before posting.
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JPG is the safest photo format for Instagram posts. PNG works for graphics; convert HEIC from iPhones to JPG before uploading from desktop tools.
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MP4 is the best everyday video format for TikTok uploads. Convert MOV/desktop exports to MP4 and compress oversized files before posting.
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JPG suits photographic LinkedIn posts; PNG suits charts, screenshots, and logos with text. Convert HEIC to JPG for desktop uploads.
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By audience
JSON, CSV, XML, YAML, Markdown — transform data and docs without uploading source to a random SaaS.
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PNG, SVG, WebP, JPG — prepare assets for web, handoff, and social without uploading brand files.
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PDF, Word, PPT, JPG — homework and submissions stay on your device while you convert.
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Extract audio, reshape video containers, and ship social-ready clips — without uploading unreleased episodes to a random converter.
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Prepare campaign creatives, compress assets, and fix format blockers for ads and landing pages — privately in the browser.
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PDF packets, spreadsheet swaps, and legacy Windows media — converted locally so internal documents never hit a public upload box.
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