Slash vs. Backslash
The slash `/` and backslash `\` are different characters with different technical uses. Unicode identifies them as SOLIDUS and REVERSE SOLIDUS, and Microsoft writing guidance distinguishes slash use in web addresses and general constructions from backslash use in server or folder paths.
A slash is `/`; a backslash is `\`. Use the character required by the technical syntax or writing context rather than treating them as interchangeable.
Key details
Important caveats
Usage Boundary
In code, file paths, and URLs, use the exact character required by the syntax; in prose, avoid using slashes as a vague replacement for words when the relationship is unclear.
Further guidance
Backslash
The backslash `\` (Unicode REVERSE SOLIDUS) is distinct and is used in technical contexts such as certain server or folder paths.
Slash
The slash `/` (Unicode SOLIDUS) appears in URLs and in several ordinary punctuation constructions.
Sources and evidence
Sources are shown with the role they play in this guide. Historical or style-sensitive claims are kept within the evidence boundary described above.
- Unicode Technical Report #25 — Mathematical symbols (opens in a new tab)Unicode Consortium · Character identities U+002F SOLIDUS and U+005C REVERSE SOLIDUS
- Slashes — Microsoft Writing Style Guide (opens in a new tab)Microsoft Learn · Writing and technical-use distinctions for slash and backslash