Bot intelligence record
Jigsaw
Review firstJigsaw is a validator bot from W3C Jigsaw used for markup validation, accessibility testing, structured-data review; it appears in server logs as `Jigsaw`.
- Operator
- W3C Jigsaw
- Family
- W3C Jigsaw
- Type
- Validator
- Source type
- Observed
- Last checked
- 2026-06-22
User-Agent Pattern
W3C JigsawJigsaw
User-agent strings are identification signals, not proof of identity. Confirm important allow, block, or rate-limit decisions with logs, DNS or IP evidence, request behavior, or operator documentation when available.
Robots.txt Snippet
Click snippet to copyUser-agent: Jigsaw
Disallow: /Click the snippet to copy it, or highlight the text manually.
Handling Guidance
AllowUse this record as bot intelligence, then verify the request source and behavior before allowing, blocking, or rate limiting.
Jigsaw is used for markup validation, accessibility testing, structured-data review, and technical page-quality checks.
Record Details
Structured data- Operator
- W3C Jigsaw
- Family
- W3C Jigsaw
- Type
- Validator
- Purpose
- Validation And Testing
- Identity type
- Documented
- Confidence
- Medium
- Last verified
- 2026-06-22
- Last checked
- 2026-06-22
- Source type
- Observed
- Verification
- Verify Jigsaw by matching `Jigsaw` to W3C Jigsaw evidence, then checking reverse DNS, source-network ownership, signed request data, or published crawler documentation when available.
- Spoofing risk
- Jigsaw has medium spoofing risk because user-agent strings can be copied; pair the match with DNS, IP, behavior, or operator evidence.
Notes
- Jigsaw is a validator bot from W3C Jigsaw used for markup validation, accessibility testing, structured-data review, and technical page-quality checks.
- Its primary user-agent pattern is
Jigsaw. - Jigsaw is verified with Medium confidence. The identity type is Documented, and the evidence basis is observed traffic patterns and user-agent evidence.
- Jigsaw does not have confirmed robots.txt behavior in the available public evidence.
- Jigsaw can usually be allowed after confirming the source and monitoring request volume.
Evidence and Source
- Verify Jigsaw by matching `Jigsaw` to W3C Jigsaw evidence, then checking reverse DNS, source-network ownership, signed request data, or published crawler documentation when available.
- Jigsaw traffic is primarily detected by the `Jigsaw` user-agent pattern. Compare source IPs, reverse DNS, request paths, and crawl cadence with W3C Jigsaw infrastructure before trusting the traffic.
- Jigsaw is used for markup validation, accessibility testing, structured-data review, and technical page-quality checks.
- Jigsaw has medium spoofing risk because user-agent strings can be copied; pair the match with DNS, IP, behavior, or operator evidence.
Monitor This Bot In Edge
Botcrawl EdgeUse Botcrawl Edge to see matching traffic, create allow or block rules, and control this bot across connected sites.