Does CRC-32 upload my file or text to Tool-You servers?

No. CRC-32 runs in this browser tab. Files stay on the device. Limit note: IEEE poly edb88320. Optional uppercase. Not collision-resistant.

Should I use Hash Text instead of CRC-32?

Use CRC-32 when you need IEEE CRC-32; optional uppercase hex. Use Hash Text when you need Hash text with SHA-2, SHA-1, or MD5. They share a category (Crypto) but not the same job.

CRC-32

IEEE CRC-32; optional uppercase hex.

Checksums UTF-8 bytes with IEEE CRC-32. Optional uppercase hex. Unlike Hash Text this is a checksum, not SHA-256. Unlike HMAC-SHA256 there is no key. Empty input yields 00000000. Not collision-resistant.

What CRC-32 does

This URL is only for CRC-32 (crypto · crc32). IEEE CRC-32; optional uppercase hex. Other Crypto tools on Tool-You look similar in the chrome, so the job definition below is the part that belongs to CRC-32 alone: Checksums UTF-8 bytes with IEEE CRC-32. Optional uppercase hex. Unlike Hash Text this is a checksum, not SHA-256. Unlike HMAC-SHA256 there is no key. Empty input yields 00000000. Not collision-resistant.

How to use CRC-32

Keep this tab on CRC-32 (/crypto/crc32). Pasting into the wrong Crypto tool (for example Hash Text) changes the job.
Paste or type the input CRC-32 expects. Path hint: crypto · crc32. IEEE CRC-32; optional uppercase hex.
Apply the CRC-32 action only. HMAC-SHA256 is a different transform (HMAC-SHA256 hex and Base64; optional uppercase.). Checksums UTF-8 bytes with IEEE CRC-32. Optional uppercase hex. Unlike Hash Text this is a checksum, not SHA-256. Unlike HMAC-SHA256 there is no key. Empty input yields 00000000. Not collision-resistant.
Copy the output of CRC-32 if you need it elsewhere. Size/complexity still follows: IEEE poly edb88320. Optional uppercase. Not collision-resistant.
If the text job is actually Hash text with SHA-2, SHA-1, or MD5., leave CRC-32 and open Hash Text.

When not to use CRC-32

Skip CRC-32 when a neighbor tool matches better — start with Hash Text or HMAC-SHA256 — or when the description already warns the job will fail. In the tool’s own words: Checksums UTF-8 bytes with IEEE CRC-32. Optional uppercase hex. Unlike Hash Text this is a checksum, not SHA-256. Unlike HMAC-SHA256 there is no key. Empty input yields 00000000. Not collision-resistant.

Questions about CRC-32

What does CRC-32 do that other Crypto pages on this site do not?: Checksums UTF-8 bytes with IEEE CRC-32. Optional uppercase hex. Unlike Hash Text this is a checksum, not SHA-256. Unlike HMAC-SHA256 there is no key. Empty input yields 00000000. Not collision-resistant. Short version: IEEE CRC-32; optional uppercase hex.
Does CRC-32 upload my file or text to Tool-You servers?: No. CRC-32 runs in this browser tab. Files stay on the device. Limit note: IEEE poly edb88320. Optional uppercase. Not collision-resistant.
Should I use Hash Text instead of CRC-32?: Use CRC-32 when you need IEEE CRC-32; optional uppercase hex. Use Hash Text when you need Hash text with SHA-2, SHA-1, or MD5. They share a category (Crypto) but not the same job.
What are the limits of CRC-32?: IEEE poly edb88320. Optional uppercase. Not collision-resistant. Also: Checksums UTF-8 bytes with IEEE CRC-32. Optional uppercase hex. Unlike Hash Text this is a checksum, not SHA-256. Unlike HMAC-SHA256 there is no key. Empty input yields 00000000. Not collision-resistant.