diff --git a/frontend/index.client.js b/frontend/index.client.js
index f5f24ae..d9fcc85 100644
--- a/frontend/index.client.js
+++ b/frontend/index.client.js
@@ -68,7 +68,7 @@ window.addEventListener('DOMContentLoaded', () => {
   let customName = '', adminUrl = '', file = null
 
   const NAME_REGEX = /^[a-zA-Z0-9+_\-\[\]*$@,;]{3,}$/
-  const EXPIRE_REGEX = /^\d+\s*[smhdwM]?$/
+  const EXPIRE_REGEX = /^\d+\s*[smhdwMY]?$/
   const submitButton = $('#submit-button')
   const deleteButton = $('#delete-button')
   const pasteEditArea = $('#paste-textarea')
@@ -83,7 +83,10 @@ window.addEventListener('DOMContentLoaded', () => {
     const pasteNotEmpty = inputType === 'edit'
       ? pasteEditArea.prop('value').length > 0
       : file !== null
-    const expirationValid = EXPIRE_REGEX.test(expiration)  // TODO: verify it
+    expirationValid = EXPIRE_REGEX.test(expiration)  // TODO: verify it
+    if (!expiration) {
+      expirationValid = true
+    }
     const nameValid = urlType !== 'custom' || NAME_REGEX.test(customName)
     const adminUrlValid = urlType !== 'admin' || isAdminUrlLegal(adminUrl)
 
diff --git a/frontend/index.html b/frontend/index.html
index 15ab1e5..01d38c3 100644
--- a/frontend/index.html
+++ b/frontend/index.html
@@ -43,7 +43,7 @@ <h2>Settings</h2>
         <div id='paste-expiration-panel' class='paste-setting-subitem-panel'>
             <input list='expiration-choices' type='text' min='60' step='1' name='paste-expiration'
                    id='paste-expiration-input' placeholder='Expiration (secs)' value='7d'>
-            <label class='small-label' for='paste-expiration-input'>Delete your paste after a period of time. <br>Units: s (seconds), m (minutes), h (hours), d (days), M (months)</label>
+            <label class='small-label' for='paste-expiration-input'>Delete your paste after a period of time (leave blank for no expiry). <br>Units: s (seconds), m (minutes), h (hours), d (days), M (months), Y (years) <br> Max 68 years</label>
         </div>
         <div id='paste-passwd-panel' class='paste-setting-subitem-panel'>
             <input type='text' spellcheck='false' name='paste-expiration' id='paste-passwd-input' placeholder='Password'>
diff --git a/src/common.js b/src/common.js
index 9f00ff9..6808348 100644
--- a/src/common.js
+++ b/src/common.js
@@ -75,7 +75,10 @@ export function parsePath(pathname) {
 }
 
 export function parseExpiration(expirationStr) {
-  const EXPIRE_REGEX = /^[\d\.]+\s*[smhdwM]?$/
+  if (!expirationStr) {
+    return NaN
+  }
+  const EXPIRE_REGEX = /^[\d\.]+\s*[smhdwMY]?$/
   if (!EXPIRE_REGEX.test(expirationStr)) {
     throw new WorkerError(400, `‘${expirationStr}’ is not a valid expiration specification`)
   }
@@ -86,7 +89,8 @@ export function parseExpiration(expirationStr) {
   else if (lastChar === 'h') expirationSeconds *= 3600
   else if (lastChar === 'd') expirationSeconds *= 3600 * 24
   else if (lastChar === 'w') expirationSeconds *= 3600 * 24 * 7
-  else if (lastChar === 'M') expirationSeconds *= 3600 * 24 * 7 * 30
+  else if (lastChar === 'M') expirationSeconds *= 3600 * 24 * 30
+  else if (lastChar === 'Y') expirationSeconds *= 3600 * 24 * 365
   return expirationSeconds
 }
 
diff --git a/src/handlers/handleWrite.js b/src/handlers/handleWrite.js
index c5138c6..0401064 100644
--- a/src/handlers/handleWrite.js
+++ b/src/handlers/handleWrite.js
@@ -25,15 +25,21 @@ async function createPaste(env, content, isPrivate, expire, short, createDate, p
     }
   }
 
-  await env.PB.put(short, content, {
-    expirationTtl: expire,
+  let options = {
     metadata: {
       postedAt: createDate,
       passwd: passwd,
       filename: filename,
       lastModified: now,
     },
-  })
+  }
+
+  if (!isNan(expire)) {
+    options.expirationTtl = expire
+  }
+
+  await env.PB.put(short, content, options)
+
   let accessUrl = env.BASE_URL + "/" + short
   const adminUrl = env.BASE_URL + "/" + short + params.SEP + passwd
   return {
@@ -101,10 +107,7 @@ export async function handlePostOrPut(request, env, ctx, isPut) {
   let expirationSeconds = undefined
   if (expire !== undefined) {
     expirationSeconds = parseExpiration(expire)
-    if (isNaN(expirationSeconds)) {
-      throw new WorkerError(400, `cannot parse expire ${expirationSeconds} as an number`)
-    }
-    if (expirationSeconds < 60) {
+    if (!isNan(expirationSeconds) && expirationSeconds < 60) {
       throw new WorkerError(
         400,
         `due to limitation of Cloudflare, expire should be a integer greater than 60, '${expirationSeconds}' given`,