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Learn and practise programming in your browser. Pick a language: write code, run it in a real terminal and follow the lessons step by step.
Why Shiklo Tools?
Simple, private tools that just work — right in your browser.
- Private Everything runs in your browser. Files are never uploaded.
- Secure Encrypted HTTPS connection, and nothing you open is stored on our servers.
- No login required No account, no sign-up, no email. Just open a tool and use it.
- Fast No upload or download wait — results appear instantly.
- Free All tools are free to use, with no limits.
- Works everywhere Phone, tablet or computer, in any modern browser.
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Frequently asked questions
Are my files or text uploaded anywhere?
No. Every tool runs inside your browser on your own device. Nothing you enter or open is sent to a server.
Do I need to create an account or log in?
No login is required. There are no accounts — open any tool and start using it straight away.
Are the tools really free?
Yes. All tools are free, with no limits or watermarks. The site is supported by ads.
Does it work on my phone?
Yes. The tools work in any modern browser on phones, tablets and computers.
Can I use the tools offline?
Once a tool has loaded it does its work on your device, so it keeps working even if your connection drops.
Which file types are supported?
PDF, Word, Excel, PowerPoint, OpenDocument and RTF documents, JPG, PNG, WebP, HEIC, AVIF, GIF and BMP images, MP4, MOV, WebM and MKV videos, MP3, WAV, M4A, OGG and FLAC audio, ZIP, 7z, RAR, TAR and GZIP archives, CSV, JSON, XML and plain text. Each tool lists exactly what it opens.
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AES Encryption
Encrypt and decrypt text or files with a password using AES-256-GCM and PBKDF2 — in your browser, with nothing uploaded.
Sometimes you need to send or store something private — a password list, a recovery code, account details, a contract — through a channel you don't fully trust, such as email, a chat app or a cloud drive. Encrypting it with a password means only someone who knows the password can read it.
This tool encrypts text or files with AES-256-GCM, the same authenticated encryption that protects HTTPS and banking apps. Your password is turned into a 256-bit key with PBKDF2-HMAC-SHA-256 and 600,000 iterations, using a random salt, so the same password gives a different result each time and guessing is slow.
Encrypted text comes out as Base64 you can paste anywhere; encrypted files are saved as .aes files that keep the original file name inside. Decrypting reverses it — and if the password is wrong or the data was changed, decryption refuses instead of producing garbage. Everything happens in your browser.
How to use AES Encryption
- Choose Text or Files, and Encrypt or Decrypt.
- Type a strong password (at least 8 characters).
- Type or paste the text, or choose the files.
- Copy or download the result. Share the password through a different channel.
Features
- AES-256-GCM authenticated encryption.
- PBKDF2-HMAC-SHA-256 with 600,000 iterations and a random salt.
- Text encrypted to Base64; files to .aes.
- Original file names restored on decryption.
- Wrong passwords and tampering are detected.
- Files up to 500 MB.
- Web Crypto API in your browser; nothing is uploaded.
How it works
Each encryption creates a random 16-byte salt and a random 12-byte nonce. The password and salt go through PBKDF2 to produce the key, and AES-256 in GCM mode encrypts the data and adds a 16-byte authentication tag. The result stores everything needed to decrypt except the password.
| Part | Size | Purpose |
|---|---|---|
| Format marker LMPBAES1 | 8 bytes | Recognises data made by this tool |
| Iteration count | 4 bytes | PBKDF2 setting used |
| Salt | 16 bytes | Makes the key unique for every encryption |
| Nonce (IV) | 12 bytes | Required by AES-GCM, never reused |
| Ciphertext and tag | data + 16 bytes | The encrypted data and its integrity check |
Choosing a password
Encryption is only as strong as the password. A random passphrase of four or more unrelated words, or a long random password from a password manager, is far stronger than a short word with a number. The tool requires at least 8 characters, but longer is much better. Share the password through a different channel from the encrypted data — for example, send the file by email and the password by phone. If the password is lost, nobody can recover the data, including us.
Compatibility
The output uses standard algorithms but its own simple container, so it is meant to be decrypted with this tool. Developers can decrypt it elsewhere by reading the layout above: derive the key with PBKDF2-SHA-256 using the stored salt and iteration count, then decrypt with AES-256-GCM using the stored nonce. For encrypted files that open in common archive programs, 7-Zip's AES-256 archives are an alternative; for email encryption between people, PGP keys from the PGP Key Generator are better suited.
Private by design
All encryption and decryption runs in your browser with the Web Crypto API, so the text, files and password never leave your device and nothing is logged. Large files are read into memory, so very large files may be slow on phones. Always keep an unencrypted backup until you have checked that you can decrypt the encrypted copy.
Related tools
To create a strong password, use the Password Generator; to check one, the Password Strength Checker. To derive keys yourself, use the PBKDF2 Generator, and for raw random keys, the Random Bytes Generator.
Frequently asked questions
How do I encrypt text with a password?
Choose Text and Encrypt, type a password and the text, then press Encrypt text and copy the result.
How do I decrypt it?
Choose Decrypt, type the same password, paste the encrypted text and press Decrypt text.
Which encryption is used?
AES-256-GCM with a key derived by PBKDF2-HMAC-SHA-256 (600,000 iterations).
Can I encrypt files?
Yes, up to 500 MB each; they are saved as .aes files.
What if I forget the password?
The data can't be recovered. Keep the password safe.
Is anything uploaded?
No. Encryption happens entirely in your browser.
Does it detect wrong passwords?
Yes. A wrong password or changed data makes decryption fail with a clear message.
Related tools
Password GeneratorGenerate strong random passwords and memorable passphrases. Choose length and characters; see entropy and crack time. Never stored or sent.
Password Strength CheckerCheck how strong a password really is: common passwords, words, names, keyboard patterns and dates detected, crack-time estimates and tips.
PBKDF2 GeneratorDerive a key from a password with PBKDF2 (HMAC-SHA-256, SHA-512 and more) — salt, iterations and length adjustable, hex or Base64 output.
Random Bytes GeneratorGenerate cryptographically secure random bytes for keys, salts, nonces and tokens — as hex, Base64, Base64url, byte arrays or a file.
PGP Key GeneratorCreate an OpenPGP key pair (ECC Curve25519 or RSA 4096) with a passphrase, expiry and revocation certificate — for email and file encryption.
Hash GeneratorGenerate MD5, SHA-1, SHA-256, SHA-512, SHA-3, BLAKE3 and CRC32 hashes of text or files of any size, with HMAC and checksum comparison. Private.