Does djb2 Hash upload my file or text to Tool-You servers?

No. djb2 Hash runs in this browser tab. Files stay on the device. Limit note: Non-empty UTF-8. Optional uppercase. Local only.

Should I use FNV-1a 32 instead of djb2 Hash?

Use djb2 Hash when you need djb2 hash; optional uppercase hex. Use FNV-1a 32 when you need 32-bit FNV-1a; optional uppercase hex. They share a category (Crypto) but not the same job.

djb2 Hash

djb2 hash; optional uppercase hex.

Classic djb2 of UTF-8 bytes. Optional uppercase. Unlike FNV-1a this uses the 5381 start. Empty text fails. Local only.

What djb2 Hash does

Classic djb2 of UTF-8 bytes. Optional uppercase. Unlike FNV-1a this uses the 5381 start. Empty text fails. Local only.

Practical limit for djb2 Hash: Non-empty UTF-8. Optional uppercase. Local only. That is why output can differ from heavy desktop Crypto software. Read the tool-specific note again: Classic djb2 of UTF-8 bytes. Optional uppercase. Unlike FNV-1a this uses the 5381 start. Empty text fails. Local only.

How to use djb2 Hash

Keep this tab on djb2 Hash (/crypto/djb2). Pasting into the wrong Crypto tool (for example FNV-1a 32) changes the job.
Paste or type the input djb2 Hash expects. Path hint: crypto · djb2. djb2 hash; optional uppercase hex.
Apply the djb2 Hash action only. CRC-32 is a different transform (IEEE CRC-32; optional uppercase hex.). Classic djb2 of UTF-8 bytes. Optional uppercase. Unlike FNV-1a this uses the 5381 start. Empty text fails. Local only.
Copy the output of djb2 Hash if you need it elsewhere. Size/complexity still follows: Non-empty UTF-8. Optional uppercase. Local only.
If the text job is actually 32-bit FNV-1a; optional uppercase hex., leave djb2 Hash and open FNV-1a 32.

When not to use djb2 Hash

Skip djb2 Hash when a neighbor tool matches better — start with FNV-1a 32 or CRC-32 — or when the description already warns the job will fail. In the tool’s own words: Classic djb2 of UTF-8 bytes. Optional uppercase. Unlike FNV-1a this uses the 5381 start. Empty text fails. Local only.

Questions about djb2 Hash

What does djb2 Hash do that other Crypto pages on this site do not?: Classic djb2 of UTF-8 bytes. Optional uppercase. Unlike FNV-1a this uses the 5381 start. Empty text fails. Local only. Short version: djb2 hash; optional uppercase hex.
Does djb2 Hash upload my file or text to Tool-You servers?: No. djb2 Hash runs in this browser tab. Files stay on the device. Limit note: Non-empty UTF-8. Optional uppercase. Local only.
Should I use FNV-1a 32 instead of djb2 Hash?: Use djb2 Hash when you need djb2 hash; optional uppercase hex. Use FNV-1a 32 when you need 32-bit FNV-1a; optional uppercase hex. They share a category (Crypto) but not the same job.
What are the limits of djb2 Hash?: Non-empty UTF-8. Optional uppercase. Local only. Also: Classic djb2 of UTF-8 bytes. Optional uppercase. Unlike FNV-1a this uses the 5381 start. Empty text fails. Local only.