Question 1

What file sizes should I use for comprehensive testing?

Accepted Answer

Use small files (50KB-200KB) for basic functionality and edge cases, medium files (500KB-2MB) for typical user scenarios, and large files (5MB+) to stress-test memory usage and performance. Always test with the actual file sizes your users will encounter.

Question 2

How do I validate file format compatibility across different platforms?

Accepted Answer

Test in Chrome, Firefox, Safari, and Edge with web-optimized formats. Validate on iOS and Android with different screen densities. Test native applications on Windows, macOS, and Linux. Verify backend file handling with various libraries. Use sample files to create automated test suites that run across all target platforms.

Question 3

Which audio format should I choose for web streaming?

Accepted Answer

AAC is the best overall choice with better quality than MP3 at the same bitrates and wide browser support. MP3 is a universal fallback that works everywhere. Opus is a future-forward choice with excellent quality and compression. Use AAC as primary with MP3 fallback.

Question 4

What's the difference between lossy and lossless compression?

Accepted Answer

Lossy compression (MP3, JPEG, MP4) removes data deemed less important, resulting in much smaller files but irreversible quality loss — best for web delivery and streaming. Lossless compression (FLAC, PNG, ZIP) reduces size without losing any data, preserving perfect quality but with larger file sizes — best for archival and editing.

Question 5

Which image formats should I use for modern web applications?

Accepted Answer

Use WebP for photos and graphics (96%+ browser support, 25-35% smaller than JPEG). AVIF for next-gen photos (85%+ support, 50%+ smaller than JPEG). JPEG as fallback with universal support. PNG for transparency and graphics. SVG for icons and simple graphics. Implement with WebP/AVIF primary and JPEG fallback via the picture element.

Question 6

How do I implement proper file type validation in my application?

Accepted Answer

Implement multi-layer validation: check the file extension, verify the MIME type, validate magic bytes (file signature), and perform real content parsing. Never rely solely on the file extension. Test with sample files that have correct extensions but wrong content to verify your validation catches mismatches.

Veelgestelde vragen

Welke bestandsgroottes moet ik testen?

Hoe valideer ik formaatcompatibiliteit?

Hoe moet ik uploads valideren?

Wat is belangrijk voor prestaties en beveiliging?

Nog vragen?