Tool Overview

This tool converts text to uppercase. You paste or type your text and see the result with every letter in capitals. You can choose a safe mode that keeps some words in their original form. Those are usually brand names, product names, and a few common terms. So you get consistent uppercase text without breaking names that must stay as they are.

Mixed case or lowercase text often needs to be turned into full uppercase. Headings, labels, or data formats may require it. Doing it by hand you can miss a word or change a brand name by mistake. This tool converts the whole block at once and can protect chosen words when you use safe mode. You can also see exactly what changed by switching to a compare view.

The tool is for anyone who edits or prepares text. Writers and editors use it for headings or style. Developers use it for constants or display. You do not need technical skills. You type or paste, optionally turn on safe mode or run the smart detect, and use the result. An optional add on detects more words to preserve; the main conversion works without it.

Background & Concept Explanation

Uppercase means capital letters. Lowercase means small letters. Most text has a mix. Sometimes you need everything in capitals. For example some headings or labels use all caps. Or you are standardizing data and want one style. Converting by hand is slow and easy to miss a word. You might also change a brand or product name that should stay as written, like iPhone or eBay. A related operation involves converting to lowercase as part of a similar workflow.

This tool offers two ways to convert. Normal mode converts every letter to uppercase. Nothing is kept. Safe uppercase mode first converts the whole text to uppercase, then puts back the original spelling for a fixed list of terms. That list includes common brand and product names and a few words like vs, Ltd, and Inc. So most text becomes uppercase but those terms stay as they are. An optional smart detect sends your text to a remote service and gets back a list of more words to preserve. Those are then restored to their original form in the result. The smart detect can fail; safe mode still works with only the built in list.

People struggle when they convert manually. They miss words. They change names. They are not sure which words to keep. This tool runs the conversion at once and lets you switch to a compare view. In that view each word that changed is highlighted. So you see what the tool changed and can check that preserved terms look right.

Key Features

• You paste or type text in an input area. There is also an upload option. You can choose a file from your device. The tool accepts plain text files with extensions .txt, .md, .js, and .ts. The file content is read as text and put into the input area. So you can load text from a file instead of pasting.
• A checkbox turns safe uppercase mode on or off. When it is off the tool converts every letter to uppercase. When it is on the tool converts the text to uppercase but then restores a set of words to their original form. The built in set includes brand and product names like iPhone, eBay, iPad, iMac, macOS, iOS, and terms like JavaScript, TypeScript, GitHub, OpenAI, vs, Ltd, and Inc. So you get uppercase text without changing those. Safe mode can also use extra words found by the smart detect add on.
• The result appears in a second area. It updates as you type or when you change the mode or the list of preserved words. You can switch between two views. Result view shows the converted text. Compare Diff view shows the same text but highlights the words that changed from the input. So you see the final output or you see what was transformed.
• Below the input a bar shows simple stats: character count, word count, and line count. Words are counted by splitting the trimmed text on whitespace. Lines are counted by splitting on newline. This helps you see how much text you have.
• Copy Result copies the converted text to the clipboard. Clear empties both input and result and resets the list of words added by smart detect. So you can reuse the result or start over.
• An optional button labeled AI Smart Detect (Add-on) sends your input text to a remote service. The service may return a list of words or phrases to preserve (for example brand names or proper nouns). The tool then turns on safe mode and uses that list in addition to the built in one. So more terms keep their original form. This step can fail or return nothing; the conversion still works with only the built in safe mode list.

Common Use Cases

You have a heading or a block of text that must be all caps. You paste it into the input, leave safe mode off, and copy the result. Everything is in uppercase. You use it in your document or design. For adjacent tasks, converting text case addresses a complementary step.

You have text that mentions brands like iPhone or eBay and you want the rest in uppercase. You turn on safe uppercase mode. The tool converts the text but keeps those names as they are. You check the compare view to see what changed and copy the result.

You are preparing content and want to protect more names or terms than the built in list. You paste the text and click the smart detect add on. If the service returns a list, safe mode is turned on and those terms are preserved in the result. You review the diff and copy. If the add on fails you can still use safe mode with the built in list only.

You have a file with text that needs to be uppercase. You use the upload option and select a .txt, .md, .js, or .ts file. The content loads into the input. You convert and copy the result or save it elsewhere. When working with related formats, converting temperatures can be a useful part of the process.

How to Use This Tool

1. Open the upper case converter in your browser.
2. Paste or type your text in the input area on the left. Or click Upload File and choose a file. The tool accepts files with extension .txt, .md, .js, or .ts and reads them as text into the input.
3. Optionally turn on Safe Uppercase Mode with the checkbox. When it is on the tool keeps a set of words (such as iPhone, eBay, JavaScript) in their original form and converts the rest to uppercase. When it is off everything is converted to uppercase.
4. Look at the result on the right. It updates as you type or change the mode. You see the converted text. Use the Result and Compare Diff buttons to switch views. Result shows the final text. Compare Diff shows the same text with changed words highlighted so you can see what was transformed.
5. Click Copy Result to copy the converted text to the clipboard. Use Clear to empty the input and result and to clear any words that were added by the smart detect add on.
6. Optionally click AI Smart Detect (Add-on). The tool sends your input to a remote service. If the service returns a list of words to preserve, safe mode is turned on and those words are kept in their original form in the result. You can then review the diff and copy. If the add on fails or returns nothing, safe mode may still be on with only the built in list; you can convert as usual.

Calculations & Logic

When safe mode is off the tool takes the input string and applies the standard uppercase conversion. Every letter becomes uppercase. Numbers, spaces, punctuation, and line breaks are unchanged. The result is one string with no letter left in lowercase.

When safe mode is on the tool first converts the whole input to uppercase. Then it restores the original spelling for certain words. The built in list is matched using word boundaries. So only whole words are restored. For example if the input contains iPhone the result will contain iPhone not IPHONE. The list includes iPhone, eBay, iPad, iMac, macOS, iOS, JavaScript, TypeScript, GitHub, OpenAI, vs, Ltd, and Inc. Each match in the original input is found in the uppercase result and replaced back with the original form. If the smart detect add on has run and returned a list, each of those words is also restored. For each such word the tool finds the uppercase form in the result (as a whole word) and replaces it with the original word from the list. So the order of operations is: uppercase all, then restore built in terms, then restore add on terms.

The compare diff splits the original and the converted text by whitespace, keeping the spaces in the list. So both become a list of pieces (words and spaces). The converted list is shown. For each position the piece is marked as changed if it is different from the piece at the same position in the original list. So you see word by word what changed. The stats (characters, words, lines) are computed from the input: characters is the length of the string, words is the number of non empty parts when the trimmed input is split on whitespace, and lines is the number of parts when the input is split on newline. In some workflows, converting units is a relevant follow-up operation.

Reference Tables or Scales

Built in preserved terms (whole words only) include: iPhone, eBay, iPad, iMac, macOS, iOS, JavaScript, TypeScript, GitHub, OpenAI, vs, Ltd, Inc. File upload accepts .txt, .md, .js, and .ts files.

Tips, Limitations & Best Practices

Use safe mode when your text has brand names, product names, or terms that must keep their spelling. The built in list covers many common cases. Use the smart detect add on if you need more terms preserved; it can fail, so check the result and use the compare view to confirm.

The compare diff view splits on whitespace. So a changed word is highlighted as a whole. If the input and result have different numbers of words (for example if a preserved term has different spacing) the alignment can shift. Check the result view for the final text. For related processing needs, converting weight units handles a complementary task.

File upload only accepts the listed file types. The file is read as text. Very large files may slow the page; the tool does not enforce a maximum size. Paste or upload only what you need to convert.

The smart detect add on uses a remote service and can fail or return an empty list. The conversion does not depend on it. You can always use safe mode with only the built in list and edit the result by hand if you need to fix a few words.

Clear resets the input, the result, and the list of words added by smart detect. It does not change the safe mode checkbox. So after clear you can type again and choose the mode and add on again.