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Combine multiple PDF files into one clean document instantly.
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Format, validate, beautify, and minify raw JSON string inputs.
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Create custom QR codes for URLs, text, Wi-Fi, and contact details.
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Convert JPG and PNG images into a clean single PDF file.
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Convert text to UPPERCASE, lowercase, Title Case, camelCase, and snake_case.
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Encode text or images into standard Base64 format strings.
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Calculate percentage of values, percentage differences, and changes easily.
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Pick colors from screen or image and export HEX, RGB, and HSL formats.
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Built from the ground up for radical speed, privacy, and simplicity

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Frequently Asked Questions

Everything you need to know about using TinyToolzz

What is TinyToolzz?
TinyToolzz is a browser-based suite of online utilities for images, PDFs, text, developer code, calculators, and unit converters. Every tool runs directly inside your web browser.
Are all tools on TinyToolzz free?
Yes. All tools on TinyToolzz are 100% free with no premium plans, hidden subscriptions, or daily limits.
Do I need to create an account?
No. You never need to sign up, provide an email address, or log in to use any tool on TinyToolzz.
Is my data safe? Do files get uploaded to a server?
Your files and text inputs are completely private. All processing is performed client-side using JavaScript and Web APIs. Zero file data is ever transmitted to external servers.
Do the tools work on mobile devices?
Yes! TinyToolzz is designed mobile-first and works seamlessly across iOS Safari, Android Chrome, mobile browsers, tablets, and desktop computers.

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Time Zone Converter

Convert wall time between global zones with DST awareness. Pick a date, choose source and target zones, and see the same instant in UTC, ISO and local formats - all in your browser.

Wall time in source zone

Fill current time or add a day

Source offset

Target offset

Converted Time
-
Pick a date and zones to convert.
UTC Instant (ISO)-
UTC Instant (UTC)-
Source wall + offset-
Target wall + offset-
All Zones Live conversion

Technical Specifications

How zones and DST are resolved - no server calls.

SpecificationDetails
Zones supported14 IANA zones: UTC, GMT, America/New_York (EST/EDT), America/Chicago (CST/CDT), America/Denver (MST/MDT), America/Los_Angeles (PST/PDT), Europe/London (GMT/BST), Europe/Paris (CET/CEST), Europe/Berlin, Asia/Kolkata (IST), Asia/Dubai (GST), Asia/Tokyo (JST), Australia/Sydney (AEDT), Pacific/Auckland
Input typedatetime-local wall time interpreted in source zone
Conversion engineIntl.DateTimeFormat with timeZone: wall wallTime asUTC -> getOffset(tz) -> UTC ms, then format UTC ms in target tz. Fallback static offsets if Intl unavailable
DST handlingAutomatic via IANA database in browser; offset like UTC-04:00 vs UTC-05:00 switches by date
Offset displayFormatted as UTC+HH:MM, e.g., UTC+05:30 for IST, UTC-04:00 for EDT
UTC instantShown as ISO 8601 Z and UTC string for the converted instant
All Zones matrixInput instant rendered in all 14 zones side by side each conversion
Processing location100% client-side JavaScript; no fetch; works offline
Usage limitNone - convert unlimited times, no signup required

Features

🌐

DST-Aware Intel

Uses the browser IANA database so New York shows EST or EDT correctly by date.

🔄

One-Tap Swap

Reverse source and target instantly to check the return leg of a meeting.

📋

Every Zone at Once

See the same instant in all 14 zones with copy buttons for fast pasting.

🔒

Private and Offline

Intl runs locally; no time or zone data leaves your device.

How to Use the Time Zone Converter

  1. Pick the Date and Time as wall time in the source zone.
  2. Choose From Zone and To Zone from the dropdowns.
  3. Read the large card: target wall time with offset, plus UTC ISO and both offsets.
  4. Check All Zones to see the instant in every supported zone instantly.
  5. Use Swap to reverse, Now for current time, Copy or Download for a report.

Understanding Time Zone Conversion

Time zones exist because the earth rotates 15 degrees per hour. Converting wall time correctly means mapping a local clock reading to its UTC instant, then rendering that instant in another zone with its own offset and DST rule.

UTC as the hub

All zones are defined as offsets from UTC. New York is UTC-05:00 in standard time and UTC-04:00 in daylight saving, London is UTC+00:00 or UTC+01:00 (BST), Kolkata is always UTC+05:30, Tokyo UTC+09:00. The converter first finds UTC for the source wall time, then formats that UTC in the target zone.

DST edges and ambiguous hours

On the night clocks go back, one wall hour occurs twice. The engine picks the first occurrence via iterative offset resolution. On the spring-forward gap, that hour does not exist and the wall time slides forward. For payroll or flights, verify with the offset badge shown.

IANA vs abbreviation

Abbreviations like EST and PST are ambiguous (EST is US and also Australia). IANA names like America/New_York uniquely encode DST history. The dropdown shows both: e.g., America/New_York (EST/EDT) so you know which rule is applied.

Honest limitations

Conversion uses the browser built-in IANA data, which is current but may lag behind political changes. Very old dates before 1970 may be approximate. For scheduling, pair with the Timestamp Converter for epoch checks and the Current Time clock for now.

Privacy and Client-Side Security

Privacy Guarantee: All conversions occur locally inside your browser. Your times and zones are never transmitted, stored, or recorded on remote servers.

Many converters query a server for offsets, leaking meeting times. TinyToolzz uses only Intl.DateTimeFormat locally, so the input wall time is resolved to UTC and re-rendered without any network call.

Because nothing is uploaded, there is no waiting, no account, and no copy retained anywhere. Your values exist only in the tab and are discarded when you close the page.

Frequently Asked Questions

How do I convert time between zones?
Pick a date and time, choose the source zone like America/New_York and the target zone like Asia/Kolkata. The converter treats the input as wall time in the source zone, finds its UTC instant via Intl, then formats that instant in the target zone with DST handled.
Does it handle daylight saving time?
Yes, when your browser supports Intl.DateTimeFormat with timeZone, DST is applied from the IANA database for the exact input date. For New York, EST is UTC-5 in winter and EDT UTC-4 in summer - the offset shown updates automatically.
What do the abbreviations mean?
UTC is Coordinated Universal Time, GMT is Greenwich Mean Time with same offset, EST is Eastern US UTC-5, PST is Pacific US UTC-8, IST is India UTC+5:30, CET is Central Europe UTC+1, JST is Japan UTC+9. The tool shows UTC offset like UTC+05:30 for clarity.
What is the difference between UTC and GMT?
They share the same clock offset 0, but UTC is the atomic scientific standard while GMT is a time zone name. For conversion they are interchangeable at UTC+00:00.
Is my time sent to a server?
No. All zone math uses the browser Intl API locally. Your times and zones never leave your device and the converter works offline.
Can I convert to my local zone quickly?
Yes, the target defaults to your detected local zone via Intl.DateTimeFormat().resolvedOptions().timeZone. Use Now to fill current wall time, or Swap to reverse source and target.

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