File
Browse 3 professional tools
File Checksum
File Size Calculator
Image Converter
File tools handle the operations between "I have a file" and "I have a file in the format my downstream tool wants". File size math (KB vs KiB confusion), checksum verification, format conversion. All run locally — files never upload.
Verification
SHA-256 / SHA-512 / SHA-1 / MD5 of files. SHA-256 is the modern default. Cross-channel verification matters: compare against checksums published on the source's main site, not the same mirror that served the file.
Conversion
Image format conversion (PNG ↔ JPEG ↔ WebP ↔ AVIF ↔ GIF) with quality controls and EXIF stripping options. File size calculator handles the KB/KiB distinction and computes transfer times at typical link speeds.
Frequently asked questions
Why does my 1 TB drive show as 931 GB on Windows?
Drive manufacturer uses 1 TB = 10^12 bytes (SI decimal). Windows shows that as 931 GiB (10^12 / 1024^3) but labels the unit "GB". The bytes are not missing; the labels are inconsistent. macOS since 2010 uses decimal units to match drive labels.
Which checksum algorithm should I use?
SHA-256 by default. Universally supported, fast on modern hardware (AES-NI / SHA-NI accelerated), no known collision attacks. SHA-1 acceptable for non-adversarial integrity (git uses it); MD5 only for legacy compatibility (corrupted-download detection on trusted mirrors).
How long should transferring a 5 GB file take?
Theoretical: 5GB / link speed in bits / 8. On Gigabit fiber (1 Gbps): 40 seconds. Real-world ≈ theoretical × 1.5-2 due to TCP overhead, server throttling, disk I/O. The File Size Calculator shows estimates for common link speeds.
Should I strip EXIF metadata when sharing photos?
For photos shared online or with strangers: yes — EXIF often contains GPS coordinates, camera serial number, timestamp. The Image Converter strips EXIF by default. For your personal archive: keep EXIF — searchability and chronology depend on it.
Last updated · E-Utils editorial team