K-Tools
Small browser tools for annoying developer jobs.
Cron schedules, JSON cleanup, Base64, and Unix timestamps. Fast utilities that run locally in your browser. No uploads.
Client-side
Copy output
SEO guides
No account
Featured
Cron scheduler
Explain a cron expression and preview the next run times (local or UTC).
SchedulingTime
JSON formatter / minifier
Format/minify/validate JSON locally. Includes “sort keys” for diff-friendly output.
Data
Base64 encode / decode
UTF-8 safe Base64 + data: URLs. Copy output or download decoded bytes.
EncodingData
All tools
Cron scheduler
FeaturedExplain a cron expression and preview the next run times (local or UTC).
SchedulingTime
JSON formatter / minifier
FeaturedFormat/minify/validate JSON locally. Includes “sort keys” for diff-friendly output.
Data
Base64 encode / decode
FeaturedUTF-8 safe Base64 + data: URLs. Copy output or download decoded bytes.
EncodingData
Unix timestamp converter
Convert Unix timestamps (seconds/ms) into local time + UTC. Copy back easily.
Time
Trending guides
Frequently surfaced Search Console guides for Base64, JSON, and cron schedule conversion.
Base64
Fix invalid character Base64 errors
Debug common decoding failures caused by URL-safe chars, padding, or whitespace.
Base64
Base64 data URLs
What data: URLs are and how to decode them safely.
Cron
Cron to time converter
Turn cron syntax into human-readable schedules and preview exact next run times.
Cron
Cron to UTC converter
Check cron schedules in UTC to avoid timezone and DST deployment mistakes.
JSON
JSON parse error fixes
Fast fixes for failed-to-parse JSON errors, including quotes, commas, escapes, and structure issues.
Cron
Cron timezone conversion examples
Copy practical UTC/local cron patterns and validate timezone behavior before deploy.
Guides
Practical answers for high-intent cron, JSON, Base64, and Unix timestamp questions.
Cron
Cron examples
Copy common schedules and open them in the Cron tool.
Cron
How to run cron every 5 minutes
Use */5 safely, avoid overlap, and test run previews before deploying.
Cron
Cron weekday schedule
Correct cron expressions for weekdays and exact business-hour times.
Cron
Cron every weekday at 9am
Use 0 9 * * 1-5 with practical variants and timezone-safe validation steps.
Cron
Cron first day of month
Reliable monthly cron patterns and timezone gotchas for billing/report jobs.
Cron
Cron last day of month
Month-end cron patterns, L support notes, and safe fallback strategies.
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